Nothing advertises the legacy protocols while they are off (LP-7)

While the switch is off, the answers that tell a mail app where to connect
stop offering what the switch closed, so a new phone or desktop app is not
sent to a port that is shut or a sign-in that will be refused:

- Thunderbird-style autoconfig (/mail/config-v1.1.xml and its other
  paths) and Outlook autodiscover leave out IMAP, POP3 and SMTP
  submission.
- PACC (/.well-known/user-agent-configuration.json) offers JMAP, CalDAV,
  CardDAV and WebDAV, and no IMAP, POP3, SMTP or ManageSieve. The document
  is rendered once per configuration load, so the JMAP-only version is
  rendered beside it and chosen per request; the _ua-auto-config digest in
  the suggested zone follows, since it hashes the same document.
- The suggested zone publishes _imap, _imaps, _pop3, _pop3s, _submission
  and _submissions with target "." -- "not offered", RFC 6186 section 3.4 --
  the spec's decision, rather than dropping them: a client that looks is
  told, and an automatically managed zone replaces the old records instead
  of leaving them behind.
- It also drops the TLSA records for ports 993 and 995. A TLS pin for a
  port the switch has closed advertises a service that is not there.
  Submission's 465 keeps its record: the SMTP lock keeps that port open.

The switch is read per answer, as sign-in reads it, so every node agrees
the moment it turns. Inbound mail, MX records and the JMAP, CalDAV and
CardDAV answers are untouched.

tests/e2e/legacy_protocols.py checks all four on a running server: with the
switch on they offer IMAP, POP3 and SMTP (the control); while it is off
they offer none of them and every legacy SRV name has target "."; and once
it is back on, autoconfig and the zone read as they did before. All checks
pass.

.github/workflows/ci.yml

@@ -37,7 +37,7 @@ jobs:
       # including one pushed by whoever compromises the account. Dependabot
       # updates both halves together -- do not "simplify" a pin back to a tag.
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-      - uses: Swatinem/rust-cache@49a0bdc70d2e1b713ca9e2869b211fcce03d3c1c # v2.9.2
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
       - name: System dependencies
         # foundationdb and the search backends are off by default, but the
         # default feature set still links against the system's C libraries.

.github/workflows/cleanup.yml

@@ -0,0 +1,69 @@
+# Prune old image versions from GHCR.
+#
+# Releases are kept forever -- they carry no assets and their generated notes
+# are this project's only changelog, so deleting one destroys history that
+# cannot be reconstructed for nothing saved. Images are the opposite: a
+# multi-arch build a week, and the by-digest push in publish.yml leaves two
+# untagged per-architecture manifests behind each time on top of the tagged
+# index. Those accumulate and nobody wants fifty of them.
+#
+# THE FOOTGUN: the obvious tool for this -- delete-package-versions with
+# `delete-only-untagged-versions` -- will happily delete the per-architecture
+# manifests that a multi-arch tag points *at*, because they are untagged by
+# design. Nothing appears to break: the tag still exists, and pulls simply
+# start failing for one architecture. This action understands manifest lists
+# and will not orphan a retained index, and `validate` re-checks every
+# multi-arch manifest against the registry afterwards.
+#
+# Separate from publish.yml, and dispatchable on its own, so `dry_run` can show
+# exactly what would be deleted without rebuilding and re-pushing an image to
+# find out.
+name: Prune images
+
+on:
+  workflow_call:
+    inputs:
+      dry_run:
+        type: boolean
+        default: false
+  workflow_dispatch:
+    inputs:
+      dry_run:
+        description: "List what would be deleted, delete nothing"
+        type: boolean
+        default: true
+
+jobs:
+  prune:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+    steps:
+      # The only third-party action here that is not published by GitHub or
+      # Docker, and the one with the most to lose: it is handed
+      # `packages: write` and its whole job is deletion, so a ref repointed at
+      # something else -- by a compromise or a mistake upstream -- is a bad
+      # day. It was pinned to a commit long before the rest of them were.
+      - uses: dataaxiom/ghcr-cleanup-action@d52806a0dc70b430571a37da1fde39733ffd640f # v1.2.2
+        with:
+          owner: inbuxa
+          package: inbuxa-server
+          token: ${{ secrets.GITHUB_TOKEN }}
+          # Ten weekly releases is roughly a quarter of history, which is more
+          # than enough to roll back to and far less than the year's worth that
+          # would otherwise pile up. Older *releases* stay either way; this
+          # only removes the images.
+          keep-n-tagged: 10
+          # Belt and braces on top of the action's own manifest awareness:
+          # `latest` is never a candidate for deletion under any counting.
+          exclude-tags: latest
+          delete-untagged: true
+          # Sweeps the wreckage of a half-failed run: an index whose platform
+          # images did not all land, and referrers whose parent is gone.
+          delete-partial-images: true
+          delete-orphaned-images: true
+          # Checks every remaining multi-architecture manifest still resolves
+          # in the registry. This is the step that would catch the footgun
+          # above rather than leaving a reader to discover it on `docker pull`.
+          validate: true
+          dry-run: ${{ inputs.dry_run }}

.github/workflows/publish.yml

@@ -0,0 +1,198 @@
+# Publish the container image to GHCR.
+#
+# The README and the docs site have told people to run
+# `ghcr.io/inbuxa/inbuxa-server:latest` for a long time, and nothing ever
+# pushed it: `docker pull` answered `denied`, because the package did not
+# exist. This is the workflow that makes those instructions true. It is also
+# the prerequisite for the self-hosted app catalogs -- TrueNAS and Unraid
+# both install by pulling an image and neither builds from source.
+#
+# FIRST RUN: a package GHCR creates for the first time is **private**, even in
+# a public repository, and an anonymous `docker pull` will still answer
+# `denied`. Nothing in a workflow can change that -- the visibility is set once
+# by hand under the package's settings, and until it is, this looks like it
+# worked while the docs stay just as wrong as before. Check with a logged-out
+# pull, not with one from a machine that has credentials.
+#
+# Two architectures, each built on its own native runner rather than under
+# QEMU. Emulated arm64 has to run `npm ci` and the Vite build through
+# instruction translation, which takes tens of minutes and occasionally runs
+# out of memory; `ubuntu-24.04-arm` is free for public repositories and does
+# the same work at native speed. The cost is the by-digest dance below: each
+# runner pushes an untagged image, and a final job joins the two digests into
+# one multi-arch tag.
+name: Publish image
+
+on:
+  release:
+    types: [published]
+  # Callable, so release.yml can build the release it just cut. This is not a
+  # stylistic choice: a release created with GITHUB_TOKEN does **not** raise a
+  # `release` event -- GitHub refuses to let a token trigger another workflow,
+  # to stop a workflow looping on its own output. A scheduled job that cut a
+  # release and expected this file to notice would silently never publish. The
+  # alternatives are a personal access token kept as a secret, or calling the
+  # workflow directly. This is the one that needs no credential.
+  workflow_call:
+    inputs:
+      ref:
+        description: "Tag, branch or SHA to build"
+        required: true
+        type: string
+      tag_latest:
+        description: "Also move :latest to this build"
+        type: boolean
+        default: false
+  # Same reasoning as ci.yml's dispatch trigger: a run GitHub queues and then
+  # orphans can be neither rerun nor canceled, and this workflow otherwise
+  # only fires on a release -- which is not something to cut twice because a
+  # runner died. `ref` also allows publishing an image for a tag that predates
+  # this workflow, which is how the first one gets built.
+  workflow_dispatch:
+    inputs:
+      ref:
+        description: "Tag, branch or SHA to build"
+        required: true
+        default: main
+      tag_latest:
+        description: "Also move :latest to this build"
+        type: boolean
+        default: false
+
+env:
+  # Hardcoded rather than derived from github.repository, which would have to
+  # be lowercased to be a legal registry path. This is the string the docs name.
+  IMAGE: ghcr.io/inbuxa/inbuxa-server
+
+jobs:
+  # The version is read once and handed to both builds, so the two
+  # architectures cannot disagree about what they are. It is read from the
+  # macro the binary itself compiles in, which the weekly release commits
+  # before this runs -- so the image is tagged with the version it reports.
+  version:
+    runs-on: ubuntu-latest
+    outputs:
+      version: ${{ steps.v.outputs.version }}
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          ref: ${{ inputs.ref || github.ref }}
+      - id: v
+        run: |
+          set -euo pipefail
+          # Scoped to the macro body: branding.rs holds other string literals,
+          # and tagging an image from one of those would be worse than failing.
+          V="$(awk '/macro_rules! brand_version/,/^}/' crates/types/src/branding.rs \
+               | grep -om1 '"[0-9][^"]*"' | tr -d '"')"
+          [ -n "$V" ] || { echo "could not read brand_version! from branding.rs" >&2; exit 1; }
+          # A date version carries nothing a Docker tag objects to, so there is
+          # no second, sanitized form of it here.
+          echo "version=$V" >> "$GITHUB_OUTPUT"
+          echo "version $V"
+
+  build:
+    needs: version
+    runs-on: ${{ matrix.runner }}
+    permissions:
+      contents: read
+      packages: write
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: linux/amd64
+            runner: ubuntu-latest
+          - platform: linux/arm64
+            runner: ubuntu-24.04-arm
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          ref: ${{ inputs.ref || github.ref }}
+      - uses: docker/setup-buildx-action@594f3bf4285d9ea8dc53c9a0c9c4092420091003 # v4.4.0
+      - uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push by digest
+        id: push
+        uses: docker/build-push-action@c3c9e263c25d99ce0380d002d59b67737d91b0dc # v7.4.0
+        with:
+          context: .
+          platforms: ${{ matrix.platform }}
+          # Attestations are off deliberately: they add manifests of their own
+          # to the index, and `imagetools create` below expects the two entries
+          # it pushed rather than four.
+          provenance: false
+          sbom: false
+          cache-from: type=gha,scope=${{ matrix.platform }}
+          cache-to: type=gha,mode=max,scope=${{ matrix.platform }}
+          outputs: type=image,name=${{ env.IMAGE }},push-by-digest=true,name-canonical=true,push=true
+      - name: Save the digest
+        run: |
+          mkdir -p /tmp/digests
+          # The prefix is stripped here and put back in the merge job, so the
+          # filename is the bare hash. Leaving it on produces
+          # `image@sha256:sha256:...` when the reference is rebuilt.
+          digest="${{ steps.push.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          # One artifact per platform; the merge job globs them back together.
+          name: digest-${{ strategy.job-index }}
+          path: /tmp/digests/*
+          retention-days: 1
+          if-no-files-found: error
+
+  # Joins the per-architecture digests into a single tagged manifest, so
+  # `docker pull ghcr.io/inbuxa/inbuxa-server:<tag>` resolves on both.
+  publish:
+    needs: [version, build]
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+        with:
+          path: /tmp/digests
+          pattern: digest-*
+          merge-multiple: true
+      - uses: docker/setup-buildx-action@594f3bf4285d9ea8dc53c9a0c9c4092420091003 # v4.4.0
+      - uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Create the manifest
+        run: |
+          # Arrays rather than a string: the tags and the digest references
+          # have to reach docker as separate arguments, and building them by
+          # word-splitting an unquoted variable is the version of this that
+          # breaks the day a value contains a space.
+          tags=(-t "${IMAGE}:${{ needs.version.outputs.version }}")
+          # :latest follows real releases only. A prerelease that moved it
+          # would hand every `:latest` deployment an unfinished build, and a
+          # dispatch run has to ask for it on purpose.
+          if [ "${{ github.event_name }}" = "release" ] && [ "${{ github.event.release.prerelease }}" = "false" ]; then
+            tags+=(-t "${IMAGE}:latest")
+          elif [ "${{ inputs.tag_latest }}" = "true" ]; then
+            tags+=(-t "${IMAGE}:latest")
+          fi
+          refs=()
+          for f in /tmp/digests/*; do
+            refs+=("${IMAGE}@sha256:$(basename "$f")")
+          done
+          echo "tags: ${tags[*]}"
+          echo "refs: ${refs[*]}"
+          docker buildx imagetools create "${tags[@]}" "${refs[@]}"
+      - name: Show what landed
+        run: docker buildx imagetools inspect "${IMAGE}:${{ needs.version.outputs.version }}"
+
+  # Runs only after a successful publish, because that is the only moment the
+  # package grows. See cleanup.yml for why this is not the obvious one-liner.
+  prune:
+    needs: publish
+    permissions:
+      packages: write
+    uses: ./.github/workflows/cleanup.yml

.github/workflows/release.yml

@@ -0,0 +1,246 @@
+# Cut a release once a week, but only if there is something in it.
+#
+# It does nothing on a quiet week. A release with no commits in it is worse
+# than no release: it moves `:latest` to an identical build, spends a version
+# number, and mails everybody watching the repository about nothing.
+#
+# INBUXA's version is a string in crates/types/src/branding.rs, deliberately
+# not in Cargo.toml so that upstream's version bumps merge without conflicts.
+# So this writes it: the bump is committed to main, and the tag names that
+# commit. The tree a tag points at therefore reports the version the tag
+# claims, which a tag placed beside an unbumped macro cannot promise.
+name: Weekly release
+
+on:
+  schedule:
+    # Mondays, 10:07 UTC, and last of the three: INBUXA Admin and the webmail
+    # release ahead of the server they talk to. Staggered rather than
+    # simultaneous so three releases do not compete for runners, and so a bad
+    # Monday names one repository instead of three. GitHub runs scheduled jobs
+    # best-effort and can delay a run considerably, so the exact minute is not
+    # a promise; the odd minute keeps it off the crowded top of the hour.
+    #
+    # Note also that GitHub disables scheduled workflows in a repository with
+    # no activity for 60 days, which is worth checking for before assuming
+    # this file is broken.
+    - cron: "7 10 * * 1"
+  workflow_dispatch:
+    inputs:
+      dry_run:
+        description: "Work out what would be released, then stop"
+        type: boolean
+        default: false
+
+# One at a time. Two overlapping runs would race to write the same version and
+# create the same tag, and the loser fails noisily for a reason that has
+# nothing to do with the code.
+concurrency:
+  group: weekly-release
+  cancel-in-progress: false
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    outputs:
+      should_release: ${{ steps.decide.outputs.should_release }}
+      version: ${{ steps.decide.outputs.version }}
+      tag: ${{ steps.decide.outputs.tag }}
+      previous: ${{ steps.decide.outputs.previous }}
+      count: ${{ steps.decide.outputs.count }}
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          ref: main
+          fetch-depth: 0
+      - id: decide
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          set -euo pipefail
+
+          # The newest published release, or empty on a repository that has
+          # never had one -- in which case everything counts as new. Drafts are
+          # excluded: an unpublished draft is not a release anybody has, so
+          # counting from it would hide commits that have never shipped.
+          previous="$(gh release list --limit 1 --exclude-drafts --json tagName --jq '.[0].tagName // ""')"
+          # A tag named by a release is normally present after a full checkout,
+          # but a release can outlive its tag. Falling back to the whole
+          # history is the safe direction to be wrong in: it over-counts, which
+          # cuts a release that was due anyway, where under-counting would skip
+          # one that was.
+          if [ -n "$previous" ] && git rev-parse -q --verify "refs/tags/${previous}" >/dev/null; then
+            count="$(git rev-list --count "${previous}..HEAD")"
+          else
+            count="$(git rev-list --count HEAD)"
+          fi
+
+          # INBUXA's version is the date: YYYY.M.D, unpadded, as branding.rs
+          # documents. A second release on one day takes a `.N` suffix,
+          # counting from 2, which is why this asks the tags rather than
+          # assuming today is free.
+          today="$(date -u +%Y.%-m.%-d)"
+          version="$today"
+          n=2
+          while git rev-parse -q --verify "refs/tags/v${version}" >/dev/null; do
+            version="${today}.${n}"
+            n=$((n + 1))
+          done
+
+          should_release=true
+          reason=""
+          if [ "$count" -eq 0 ]; then
+            should_release=false
+            reason="no commits since ${previous}"
+          fi
+
+          {
+            echo "should_release=$should_release"
+            echo "version=$version"
+            echo "tag=v${version}"
+            echo "previous=$previous"
+            echo "count=$count"
+          } >> "$GITHUB_OUTPUT"
+
+          # Written to the run summary so a skipped week reads as a decision
+          # rather than as a workflow that quietly did nothing.
+          {
+            echo "### Weekly release"
+            echo
+            if [ "$should_release" = "true" ]; then
+              echo "Releasing **v${version}** — ${count} commit(s) since ${previous:-the beginning}."
+            else
+              echo "Nothing to release: ${reason}."
+            fi
+          } >> "$GITHUB_STEP_SUMMARY"
+
+  cut:
+    needs: check
+    if: needs.check.outputs.should_release == 'true' && !inputs.dry_run
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    outputs:
+      sha: ${{ steps.land.outputs.sha }}
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          ref: main
+          fetch-depth: 0
+      - id: bump
+        env:
+          VERSION: ${{ needs.check.outputs.version }}
+          BRANCH: release/v${{ needs.check.outputs.version }}
+        run: |
+          set -euo pipefail
+
+          # Scoped to the macro body rather than replacing the first quoted
+          # string in the file, and asserted to have matched exactly once.
+          # branding.rs holds other string literals, and a bump that silently
+          # edited one of those -- or none -- would ship a build whose version
+          # disagrees with its tag.
+          python3 - <<'PY'
+          import os, re
+          path = "crates/types/src/branding.rs"
+          src = open(path, encoding="utf-8").read()
+          pattern = re.compile(r'(macro_rules! brand_version \{\s*\(\) => \{\s*")[^"]+(")')
+          out, n = pattern.subn(lambda m: m.group(1) + os.environ["VERSION"] + m.group(2), src, count=1)
+          assert n == 1, f"brand_version! not found in {path}"
+          open(path, "w", encoding="utf-8").write(out)
+          PY
+
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git add crates/types/src/branding.rs
+          git commit -m "Version ${VERSION}"
+          git push origin "HEAD:refs/heads/${BRANCH}"
+
+      # main is protected: it takes a pull request with a green build, and
+      # GITHUB_TOKEN is not among the bypass actors. So the bump lands the way
+      # every other change does. The alternative was to hand the release a
+      # credential that outranks the rule, which is a worse thing to own than
+      # a slower Monday.
+      - id: land
+        env:
+          VERSION: ${{ needs.check.outputs.version }}
+          BRANCH: release/v${{ needs.check.outputs.version }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          set -euo pipefail
+
+          url="$(gh pr create --base main --head "${BRANCH}" \
+            --title "Version ${VERSION}" \
+            --body "Weekly release. Bumps \`brand_version!\` to ${VERSION} so the tag names a tree that reports the version the tag claims.")"
+          # The number, not the branch: the branch is deleted on merge, and a
+          # deleted branch no longer resolves to its pull request.
+          pr="${url##*/}"
+          echo "Opened #${pr}"
+
+          # The build is what the rule actually requires, and it is also the
+          # thing worth waiting for: a release cut from a tree that does not
+          # compile is the failure this whole arrangement exists to prevent.
+          # A full build of this tree is long, so the deadline is generous.
+          deadline=$(( SECONDS + 3600 ))
+          while :; do
+            state="$(gh pr view "${pr}" --json statusCheckRollup \
+              --jq '[.statusCheckRollup[]? | .conclusion // "PENDING"] | join(",")')"
+            case "${state}" in
+              *FAILURE*|*CANCELLED*|*TIMED_OUT*)
+                echo "::error::CI failed on ${BRANCH} (${state}); no release cut. PR #${pr} is left open."
+                exit 1 ;;
+              *SUCCESS*) break ;;
+            esac
+            if [ "${SECONDS}" -ge "${deadline}" ]; then
+              echo "::error::timed out waiting for CI on ${BRANCH}. PR #${pr} is left open."
+              exit 1
+            fi
+            sleep 30
+          done
+
+          gh pr merge "${pr}" --rebase --delete-branch
+
+          # A rebase merge rewrites the commit, so the sha to tag is the one
+          # GitHub recorded for the merge, not the tip that was pushed. It can
+          # take a moment to appear.
+          sha=""
+          for _ in $(seq 1 30); do
+            sha="$(gh pr view "${pr}" --json mergeCommit --jq '.mergeCommit.oid // ""')"
+            [ -n "${sha}" ] && break
+            sleep 5
+          done
+          if [ -z "${sha}" ]; then
+            echo "::error::#${pr} merged but GitHub reported no merge commit; nothing safe to tag."
+            exit 1
+          fi
+
+          echo "sha=${sha}" >> "$GITHUB_OUTPUT"
+      - env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          set -euo pipefail
+          args=(--target "${{ steps.land.outputs.sha }}"
+                --title "INBUXA ${{ needs.check.outputs.version }}"
+                --generate-notes)
+          # Bound the notes to what is actually new. Without a start tag the
+          # generator reaches back to whatever it decides is previous, which on
+          # a repository carrying upstream's tag shapes is not always the last
+          # release.
+          if [ -n "${{ needs.check.outputs.previous }}" ]; then
+            args+=(--notes-start-tag "${{ needs.check.outputs.previous }}")
+          fi
+          gh release create "${{ needs.check.outputs.tag }}" "${args[@]}"
+
+  # Called rather than left to the `release` trigger on purpose: see the note
+  # at the top of publish.yml. A release created with GITHUB_TOKEN raises no
+  # event, so without this the tag would exist and no image would follow it.
+  publish:
+    needs: [check, cut]
+    permissions:
+      contents: read
+      packages: write
+    uses: ./.github/workflows/publish.yml
+    with:
+      ref: ${{ needs.cut.outputs.sha }}
+      tag_latest: true

.gitignore

@@ -9,6 +9,7 @@ run.sh
 !.gitignore
 !.gitattributes
 !.github
+!.gitlab-ci.yml
 CLAUDE.md
 
 # The cutover rehearsal writes its fixture and state here.

.gitlab-ci.yml

@@ -0,0 +1,50 @@
+# CI on the self-hosted GitLab, ported from .github/workflows/ci.yml when the
+# GitHub account was suspended on 2026-09-20. The Actions file stays in the
+# tree: it is the reference this was written from and works unchanged if the
+# appeal succeeds.
+#
+# The image is pinned by digest, with its tag in the trailing comment. That
+# replaces the SHA-pinned `uses:` in the workflow -- GitLab has no action
+# allowlist, so the digest is the only thing fixing what actually runs.
+#
+# Not ported here:
+#   * cleanup.yml pruned GHCR with dataaxiom/ghcr-cleanup-action. GitLab has
+#     no equivalent action because it does not need one: the container
+#     registry has a cleanup policy on the project itself, which is where that
+#     job's settings now live.
+#   * publish.yml and release.yml still need doing; they are larger and are
+#     being handled separately.
+
+stages: [build]
+
+default:
+  interruptible: true
+
+build:
+  stage: build
+  image: rust:1-bookworm@sha256:93ce27a88655056a51dbdd8f5f2d7ddc071c7b0070fb288a37b5a285fc83971e # 1-bookworm
+  # This is a big workspace and a cold build is expensive, so the registry and
+  # the target directory are cached between runs. Both are kept inside the
+  # project directory because that is the only path the runner will cache --
+  # and deliberately not on /tmp, which on this host is a tmpfs that a Rust
+  # build of this size has filled before.
+  variables:
+    CARGO_HOME: "$CI_PROJECT_DIR/.cargo"
+    CARGO_TARGET_DIR: "$CI_PROJECT_DIR/target"
+    CARGO_INCREMENTAL: "0"
+  cache:
+    key:
+      files: [Cargo.lock]
+    paths:
+      - .cargo/registry/
+      - target/
+  before_script:
+    - apt-get update -qq && apt-get install -y -qq --no-install-recommends clang >/dev/null
+  script:
+    - cargo build -p inbuxa --locked
+    # --no-run: the workflow compiled every test target without running them,
+    # which catches a test that no longer builds without paying for the suite.
+    - cargo test --workspace --locked --no-run
+  rules:
+    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

CONTRIBUTING.md

@@ -11,6 +11,25 @@ and it should be worth that.
 
 Small fixes — a bug, a typo, a test — need no ceremony. Send them.
 
+## How a change lands
+
+`main` is protected. It cannot be force-pushed or deleted, and a change
+reaches it through a pull request whose `build` check has passed. No approving
+review is required — this is a small project and a gate nobody can pass is not
+a gate — but the build is not optional.
+
+So the shape of a change is: a branch, a pull request, a green CI run, a merge.
+Branches are deleted on merge. Repository administrators can bypass the rule,
+which exists so the maintainer can correct the tree quickly, not so that the
+ordinary path can be skipped; use it for an emergency, not for convenience.
+
+Releases are cut weekly from `main` by `.github/workflows/release.yml`, on
+Monday morning UTC, and nothing is released on a quiet week. That is the reason
+the rule matters: whatever is on `main` when the run starts is what ships, so
+`main` is expected to be releasable at all times rather than at the end of a
+piece of work. A change that is not finished should be behind something that
+defaults to off, or it should not be on `main` yet.
+
 ## What this repository is
 
 INBUXA is a fork of Stalwart, taken under the AGPL-3.0-only half of its dual

Cargo.lock

@@ -597,12 +597,6 @@ version = "0.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
 
-[[package]]
-name = "base64"
-version = "0.21.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d297deb1925b89f2ccc13d7635fa0714f12c87adce1c75356b39ca9b7178567"
-
 [[package]]
 name = "base64"
 version = "0.22.1"
@@ -1041,16 +1035,16 @@ dependencies = [
 
 [[package]]
 name = "calcard"
-version = "0.3.13"
+version = "0.3.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "75b779382e675380a1ff8a4873acee5ba60158be7a00458fb98e6b85aad1f2ee"
+checksum = "c601473ec15a875626bce73db1a1f0fc81e9c949ca25f1463b714947c0a70a1f"
 dependencies = [
  "ahash",
  "chrono",
  "chrono-tz",
  "hashify",
  "jmap-tools",
- "mail-builder 0.5.0",
+ "mail-builder 1.0.0",
  "mail-parser",
  "rkyv",
  "serde",
@@ -1987,11 +1981,10 @@ dependencies = [
 
 [[package]]
 name = "decancer"
-version = "3.3.3"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a9244323129647178bf41ac861a2cdb9d9c81b9b09d3d0d1de9cd302b33b8a1d"
+checksum = "453589e364ce786381e7bcbf0d659088ff7e4d3e77f948dd1cf861344acf7a86"
 dependencies = [
- "lazy_static",
  "regex",
 ]
 
@@ -2309,11 +2302,11 @@ dependencies = [
 
 [[package]]
 name = "ece"
-version = "2.3.1"
+version = "2.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c2ea1d2f2cc974957a4e2575d8e5bb494549bab66338d6320c2789abcfff5746"
+checksum = "c2467bac73e5a36d75e16cab0fa8d40676f075db6afde7d78b35f033e1f66e37"
 dependencies = [
- "base64 0.21.7",
+ "base64 0.22.1",
  "byteorder",
  "hex",
  "hkdf 0.12.4",
@@ -2322,7 +2315,7 @@ dependencies = [
  "openssl",
  "serde",
  "sha2 0.10.9",
- "thiserror 1.0.69",
+ "thiserror 2.0.20",
 ]
 
 [[package]]
@@ -3540,7 +3533,7 @@ dependencies = [
  "libc",
  "percent-encoding",
  "pin-project-lite",
- "socket2 0.6.5",
+ "socket2 0.5.10",
  "tokio",
  "tower-service",
  "tracing",
@@ -4401,9 +4394,9 @@ dependencies = [
 
 [[package]]
 name = "jsonwebtoken"
-version = "11.0.0"
+version = "11.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "881733cbc631fc9e472e24447ce32a64bedf2da498d6d8570b08edc87de71f65"
+checksum = "e75fe14a82d81e5f5af639997db37d8b96045938a7ac6ab18cdbe1c7467e05e1"
 dependencies = [
  "aws-lc-rs",
  "base64 0.22.1",
@@ -4616,9 +4609,9 @@ dependencies = [
 
 [[package]]
 name = "librocksdb-sys"
-version = "0.17.3+10.4.2"
+version = "0.19.0+11.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cef2a00ee60fe526157c9023edab23943fae1ce2ab6f4abb2a807c1746835de9"
+checksum = "4f45e86edad8e88efe97dbf384b4e48e1ff0f111eabf154c7b09d7a1e5fb573c"
 dependencies = [
  "bindgen",
  "bzip2-sys",
@@ -4626,6 +4619,7 @@ dependencies = [
  "libc",
  "libz-sys",
  "lz4-sys",
+ "rustflags",
  "zstd-sys",
 ]
 
@@ -5532,8 +5526,8 @@ dependencies = [
 
 [[package]]
 name = "opentelemetry"
-version = "0.31.0"
+version = "0.32.0"
-source = "git+https://github.com/stalwartlabs/opentelemetry-rust#274b4d324794280ce6f4def095a3428197a9e6e3"
+source = "git+https://github.com/stalwartlabs/opentelemetry-rust#80a14a3b6846f62f85506d68d2600c948fccc9d2"
 dependencies = [
  "futures-core",
  "futures-sink",
@@ -5545,8 +5539,8 @@ dependencies = [
 
 [[package]]
 name = "opentelemetry-http"
-version = "0.31.0"
+version = "0.32.0"
-source = "git+https://github.com/stalwartlabs/opentelemetry-rust#274b4d324794280ce6f4def095a3428197a9e6e3"
+source = "git+https://github.com/stalwartlabs/opentelemetry-rust#80a14a3b6846f62f85506d68d2600c948fccc9d2"
 dependencies = [
  "async-trait",
  "bytes",
@@ -5557,10 +5551,11 @@ dependencies = [
 
 [[package]]
 name = "opentelemetry-otlp"
-version = "0.31.0"
+version = "0.32.0"
-source = "git+https://github.com/stalwartlabs/opentelemetry-rust#274b4d324794280ce6f4def095a3428197a9e6e3"
+source = "git+https://github.com/stalwartlabs/opentelemetry-rust#80a14a3b6846f62f85506d68d2600c948fccc9d2"
 dependencies = [
  "http 1.5.0",
+ "httpdate",
  "opentelemetry",
  "opentelemetry-http",
  "opentelemetry-proto",
@@ -5575,8 +5570,8 @@ dependencies = [
 
 [[package]]
 name = "opentelemetry-proto"
-version = "0.31.0"
+version = "0.32.0"
-source = "git+https://github.com/stalwartlabs/opentelemetry-rust#274b4d324794280ce6f4def095a3428197a9e6e3"
+source = "git+https://github.com/stalwartlabs/opentelemetry-rust#80a14a3b6846f62f85506d68d2600c948fccc9d2"
 dependencies = [
  "opentelemetry",
  "opentelemetry_sdk",
@@ -5587,13 +5582,13 @@ dependencies = [
 
 [[package]]
 name = "opentelemetry-semantic-conventions"
-version = "0.31.0"
+version = "0.32.1"
-source = "git+https://github.com/stalwartlabs/opentelemetry-rust#274b4d324794280ce6f4def095a3428197a9e6e3"
+source = "git+https://github.com/stalwartlabs/opentelemetry-rust#80a14a3b6846f62f85506d68d2600c948fccc9d2"
 
 [[package]]
 name = "opentelemetry_sdk"
-version = "0.31.0"
+version = "0.32.1"
-source = "git+https://github.com/stalwartlabs/opentelemetry-rust#274b4d324794280ce6f4def095a3428197a9e6e3"
+source = "git+https://github.com/stalwartlabs/opentelemetry-rust#80a14a3b6846f62f85506d68d2600c948fccc9d2"
 dependencies = [
  "futures-channel",
  "futures-executor",
@@ -6265,7 +6260,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b570b25f7617e43d59005d0990ccb79e950a423952cea19671b7a876da390adf"
 dependencies = [
  "anyhow",
- "itertools 0.14.0",
+ "itertools 0.13.0",
  "proc-macro2",
  "quote",
  "syn 2.0.119",
@@ -6404,7 +6399,7 @@ dependencies = [
  "quinn-udp",
  "rustc-hash",
  "rustls",
- "socket2 0.6.5",
+ "socket2 0.5.10",
  "thiserror 2.0.20",
  "tokio",
  "tracing",
@@ -6445,7 +6440,7 @@ dependencies = [
  "cfg_aliases",
  "libc",
  "once_cell",
- "socket2 0.6.5",
+ "socket2 0.5.10",
  "tracing",
  "windows-sys 0.61.2",
 ]
@@ -7070,9 +7065,9 @@ dependencies = [
 
 [[package]]
 name = "rocksdb"
-version = "0.24.0"
+version = "0.25.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ddb7af00d2b17dbd07d82c0063e25411959748ff03e8d4f96134c2ff41fce34f"
+checksum = "d8d90add70d1d420ee487bce4a1449880a8d147451c6051b2ee5f8354553dcbf"
 dependencies = [
  "libc",
  "librocksdb-sys",
@@ -7213,6 +7208,12 @@ dependencies = [
  "semver",
 ]
 
+[[package]]
+name = "rustflags"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a39e0e9135d7a7208ee80aa4e3e4b88f0f5ad7be92153ed70686c38a03db2e63"
+
 [[package]]
 name = "rusticata-macros"
 version = "4.1.0"
@@ -7237,9 +7238,9 @@ dependencies = [
 
 [[package]]
 name = "rustls"
-version = "0.23.44"
+version = "0.23.45"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6725596c3f2c3a0aef021139e145d4eafe314a6623e4680ca83852b2c67ab2ba"
+checksum = "0d41d731c7d2f962d1ccc364cec258de3c0e93b38c2fb3ba97ac74513048d634"
 dependencies = [
  "aws-lc-rs",
  "log",
@@ -7579,7 +7580,7 @@ dependencies = [
  "sha2 0.10.9",
  "sha3 0.10.9",
  "slh-dsa",
- "thiserror 2.0.20",
+ "thiserror 1.0.69",
  "twofish",
  "typenum",
  "x25519-dalek",
@@ -8736,18 +8737,9 @@ dependencies = [
 
 [[package]]
 name = "tinyvec"
-version = "1.13.2"
+version = "1.13.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4cf0ded5c4e56918d8f8a339e1bb67d038d3bc6d144ac407904015ba2e4cde9b"
+checksum = "fd3ca314f692efd6c868f8408f53fe444634a845f96c028b97d35f6a1f79f0ee"
-dependencies = [
- "tinyvec_macros",
-]
-
-[[package]]
-name = "tinyvec_macros"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
 
 [[package]]
 name = "tls-listener"

crates/common/Cargo.toml

@@ -54,7 +54,7 @@ sha2 = "0.11"
 md5 = "0.8.1"
 whatlang = "0.18"
 idna = "1.1"
-decancer = "3.3.3"
+decancer = "4.0.0"
 unicode-security = "0.1.2"
 infer = "0.22"
 bincode = { version = "2.0.1", features = ["serde"] }

crates/common/src/config/inner.rs

@@ -67,6 +67,7 @@ impl Data {
 
         Data {
             spam_classifier: ArcSwap::from_pointee(SpamClassifier::default()),
+            listener_control: Default::default(),
             tls_certificates: ArcSwap::from_pointee(certificates),
             tls_self_signed_cert: build_self_signed_cert(
                 subject_names
@@ -222,6 +223,7 @@ impl Default for Data {
     fn default() -> Self {
         Self {
             spam_classifier: Default::default(),
+            listener_control: Default::default(),
             tls_certificates: Default::default(),
             tls_self_signed_cert: Default::default(),
             blocked_ips: Default::default(),

crates/common/src/config/network.rs

@@ -47,6 +47,9 @@ pub struct Network {
 #[derive(Clone)]
 pub struct NetworkInfo {
     pub pacc: Pacc,
+    /// inbuxa: the same document without IMAP, POP3, SMTP and ManageSieve,
+    /// served while legacy protocols are off (legacy-protocols LP-7).
+    pub pacc_jmap_only: Pacc,
     pub mxs: Vec<MailExchanger>,
     pub services: VecMap<ServiceProtocol, Service>,
 }
@@ -320,11 +323,26 @@ impl Network {
             }
         }
 
-        let (prefix, suffix) = serde_json::to_string(&pacc)
+        let split = |pacc: &Configuration| {
-            .unwrap_or_default()
+            serde_json::to_string(pacc)
-            .rsplit_once(SPLIT_HERE)
+                .unwrap_or_default()
-            .map(|(prefix, suffix)| (prefix.to_string(), suffix.to_string()))
+                .rsplit_once(SPLIT_HERE)
-            .unwrap();
+                .map(|(prefix, suffix)| Pacc {
+                    prefix: prefix.to_string(),
+                    suffix: suffix.to_string(),
+                })
+                .unwrap()
+        };
+        // inbuxa: legacy-protocols LP-7
+        let pacc_jmap_only = {
+            let mut pacc = pacc.clone();
+            pacc.protocols.imap = None;
+            pacc.protocols.pop3 = None;
+            pacc.protocols.smtp = None;
+            pacc.protocols.managesieve = None;
+            split(&pacc)
+        };
+        let pacc = split(&pacc);
         let mut network = Network {
             node_id: bp.node_id() as u64,
             server_name: default_hostname.to_string(),
@@ -339,7 +357,8 @@ impl Network {
             info: NetworkInfo {
                 mxs: system.mail_exchangers.into_iter().collect(),
                 services: system.services,
-                pacc: Pacc { prefix, suffix },
+                pacc,
+                pacc_jmap_only,
             },
         };
 

crates/common/src/lib.rs

@@ -150,6 +150,10 @@ pub struct Data {
     pub blocked_ips: RwLock<BlockedIps>,
     pub lookup_stores: ArcSwap<AHashMap<Box<str>, InMemoryStore>>,
 
+    // inbuxa: the running listeners and their shutdown switches, so one
+    // protocol's ports can close while the rest keep accepting (LP-2)
+    pub listener_control: crate::network::control::ListenerControl,
+
     pub asn_geo_data: AsnGeoLookupData,
 
     pub jmap_id_gen: SnowflakeIdGenerator,

crates/common/src/network/autoconfig/autodiscover.rs

@@ -2,9 +2,11 @@
  * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
  *
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ *
+ * Modified by Coffey Labs in 2026 for INBUXA.
  */
 
-use crate::{Server, manager::application::Resource};
+use crate::{Server, manager::application::Resource, network::legacy::is_legacy_service};
 use quick_xml::Reader;
 use quick_xml::XmlVersion;
 use quick_xml::events::Event;
@@ -55,7 +57,12 @@ impl Server {
         let _ = writeln!(&mut config, "\t\t<Account>");
         let _ = writeln!(&mut config, "\t\t\t<AccountType>email</AccountType>");
         let _ = writeln!(&mut config, "\t\t\t<Action>settings</Action>");
+        // inbuxa: legacy-protocols LP-7
+        let legacy_off = self.legacy_protocols_off().await?;
         for (protocol, service) in &self.core.network.info.services {
+            if legacy_off && is_legacy_service(protocol) {
+                continue;
+            }
             let (protocol, ports) = match protocol {
                 ServiceProtocol::Imap => ("IMAP", [143, 993]),
                 ServiceProtocol::Pop3 => ("POP3", [110, 995]),

crates/common/src/network/autoconfig/legacy_autoconfig.rs

@@ -2,9 +2,11 @@
  * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
  *
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ *
+ * Modified by Coffey Labs in 2026 for INBUXA.
  */
 
-use crate::{Server, manager::application::Resource};
+use crate::{Server, manager::application::Resource, network::legacy::is_legacy_service};
 use registry::schema::enums::ServiceProtocol;
 use std::fmt::Write;
 use utils::url_params::UrlParams;
@@ -28,6 +30,9 @@ impl Server {
             ("%EMAILADDRESS%", default_host.as_str())
         };
 
+        // inbuxa: legacy-protocols LP-7
+        let legacy_off = self.legacy_protocols_off().await?;
+
         // Build XML response
         let mut config = String::with_capacity(1024);
         config.push_str("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
@@ -40,6 +45,9 @@ impl Server {
             "\t\t<displayShortName>{domain}</displayShortName>"
         );
         for (protocol, service) in &self.core.network.info.services {
+            if legacy_off && is_legacy_service(protocol) {
+                continue;
+            }
             let (protocol, tag, ports) = match protocol {
                 ServiceProtocol::Smtp => ("smtp", "outgoingServer", [587, 465]),
                 ServiceProtocol::Imap => ("imap", "incomingServer", [143, 993]),

crates/common/src/network/control.rs

@@ -0,0 +1,299 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Coffey Labs
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+//! Per-listener shutdown (legacy-protocols spec, LP-2).
+//!
+//! Upstream gives every listener a clone of one `watch` channel, so the only
+//! shutdown signal that exists stops all of them at once — port 25 included.
+//! That is enough for "stop the server" and no use at all for "close the IMAP
+//! port and leave the rest running", which is what the legacy-protocols switch
+//! needs.
+//!
+//! So each listener gets its own channel, and this registry holds the sending
+//! ends, keyed by listener id. Firing one stops exactly one listener: the
+//! accept loop in [`super::listen`] breaks and drops its `TcpListener`, which
+//! closes the socket. Whole-server shutdown still works, by firing all of them
+//! ([`ListenerControl::stop_all`]).
+//!
+//! What this does **not** do is touch the host's firewall, NAT port-forwards
+//! or any proxy in front of the server (LP-20). Closing a listener means this
+//! process stops answering; anything that still routes the port is the
+//! operator's to reconcile, and is deliberately left alone.
+
+use crate::config::server::{Listener, ServerProtocol};
+use crate::network::TcpAcceptor;
+use ahash::AHashMap;
+use parking_lot::RwLock;
+use std::sync::OnceLock;
+use tokio::sync::watch;
+
+/// How a listener is spawned. Only `main` knows how to build the session
+/// manager for a protocol, so it leaves this behind at startup and the policy
+/// uses it to put a listener back without a restart (LP-5).
+pub type SpawnListener = Box<dyn Fn(Listener, TcpAcceptor, watch::Receiver<bool>) + Send + Sync>;
+
+/// A listener that is currently accepting, and the switch that stops it.
+struct Running {
+    protocol: ServerProtocol,
+    ports: Vec<u16>,
+    shutdown_tx: watch::Sender<bool>,
+}
+
+/// What a caller is told about a running listener.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct ListenerInfo {
+    pub id: String,
+    pub protocol: ServerProtocol,
+    pub ports: Vec<u16>,
+}
+
+/// The registry of running listeners and their shutdown switches.
+#[derive(Default)]
+pub struct ListenerControl {
+    running: RwLock<AHashMap<String, Running>>,
+    spawner: OnceLock<SpawnListener>,
+}
+
+impl ListenerControl {
+    /// Registers a listener about to be spawned, returning the receiver its
+    /// accept loop should select on.
+    pub fn register(
+        &self,
+        id: impl Into<String>,
+        protocol: ServerProtocol,
+        ports: Vec<u16>,
+    ) -> watch::Receiver<bool> {
+        let (shutdown_tx, shutdown_rx) = watch::channel(false);
+        self.running.write().insert(
+            id.into(),
+            Running {
+                protocol,
+                ports,
+                shutdown_tx,
+            },
+        );
+        shutdown_rx
+    }
+
+    /// Remembers how to spawn a listener, once, at startup. Later calls are
+    /// ignored, so nothing can swap the spawner out from under a running
+    /// server.
+    pub fn set_spawner(&self, spawner: SpawnListener) {
+        let _ = self.spawner.set(spawner);
+    }
+
+    /// Whether a spawner has been left behind. Without one, a listener can be
+    /// stopped but not started, and the caller has to say so rather than
+    /// promise a port that will not open until a restart.
+    pub fn can_spawn(&self) -> bool {
+        self.spawner.get().is_some()
+    }
+
+    /// Starts a listener and registers it, so it can be stopped again.
+    /// Returns false when no spawner was left behind.
+    pub fn spawn(&self, listener: Listener, acceptor: TcpAcceptor) -> bool {
+        let Some(spawner) = self.spawner.get() else {
+            return false;
+        };
+
+        let ports = listener.listeners.iter().map(|l| l.addr.port()).collect();
+        let shutdown_rx = self.register(listener.id.clone(), listener.protocol, ports);
+        spawner(listener, acceptor, shutdown_rx);
+        true
+    }
+
+    /// Stops one listener by id. Returns what was stopped, or `None` when no
+    /// listener of that id is running.
+    pub fn stop(&self, id: &str) -> Option<ListenerInfo> {
+        let running = self.running.write().remove(id).map(|running| {
+            let _ = running.shutdown_tx.send(true);
+            ListenerInfo {
+                id: id.to_string(),
+                protocol: running.protocol,
+                ports: running.ports,
+            }
+        });
+        running
+    }
+
+    /// Stops every running listener whose protocol `is_legacy` accepts, except
+    /// those whose id is in `keep`. Returns what was stopped.
+    ///
+    /// The caller decides what counts as legacy, because the inbound SMTP
+    /// listener shares its protocol with submission and must never be stopped
+    /// (LP-3); `keep` is how it is spared.
+    pub fn stop_matching(
+        &self,
+        is_legacy: impl Fn(ServerProtocol, &[u16]) -> bool,
+        keep: &[String],
+    ) -> Vec<ListenerInfo> {
+        let ids: Vec<String> = {
+            let running = self.running.read();
+            running
+                .iter()
+                .filter(|(id, listener)| {
+                    !keep.contains(id) && is_legacy(listener.protocol, &listener.ports)
+                })
+                .map(|(id, _)| id.clone())
+                .collect()
+        };
+
+        ids.iter().filter_map(|id| self.stop(id)).collect()
+    }
+
+    /// Stops everything. This is whole-server shutdown, and replaces the single
+    /// shared channel upstream fired.
+    pub fn stop_all(&self) {
+        for (_, running) in self.running.write().drain() {
+            let _ = running.shutdown_tx.send(true);
+        }
+    }
+
+    /// Every listener currently accepting.
+    pub fn running(&self) -> Vec<ListenerInfo> {
+        let mut out: Vec<ListenerInfo> = self
+            .running
+            .read()
+            .iter()
+            .map(|(id, listener)| ListenerInfo {
+                id: id.clone(),
+                protocol: listener.protocol,
+                ports: listener.ports.clone(),
+            })
+            .collect();
+        out.sort_by(|a, b| a.id.cmp(&b.id));
+        out
+    }
+
+    /// Whether a listener of this id is accepting.
+    pub fn is_running(&self, id: &str) -> bool {
+        self.running.read().contains_key(id)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn control() -> ListenerControl {
+        let control = ListenerControl::default();
+        control.register("smtp", ServerProtocol::Smtp, vec![25]);
+        control.register("submission", ServerProtocol::Smtp, vec![465]);
+        control.register("imap", ServerProtocol::Imap, vec![993]);
+        control.register("pop3", ServerProtocol::Pop3, vec![995]);
+        control.register("sieve", ServerProtocol::ManageSieve, vec![4190]);
+        control.register("https", ServerProtocol::Http, vec![443]);
+        control
+    }
+
+    /// One listener stops and the others keep accepting (LP-2).
+    #[test]
+    fn stop_one_leaves_the_rest() {
+        let control = control();
+
+        let stopped = control.stop("imap").expect("imap was running");
+        assert_eq!(stopped.protocol, ServerProtocol::Imap);
+        assert_eq!(stopped.ports, vec![993]);
+
+        assert!(!control.is_running("imap"));
+        for still in ["smtp", "submission", "pop3", "sieve", "https"] {
+            assert!(control.is_running(still), "{still} should still accept");
+        }
+    }
+
+    /// Stopping the same listener twice is not an error, and says so.
+    #[test]
+    fn stop_is_idempotent() {
+        let control = control();
+        assert!(control.stop("imap").is_some());
+        assert!(control.stop("imap").is_none());
+    }
+
+    /// The accept loop's receiver sees the stop.
+    #[test]
+    fn the_listener_is_told() {
+        let control = ListenerControl::default();
+        let rx = control.register("imap", ServerProtocol::Imap, vec![993]);
+
+        assert!(!*rx.borrow());
+        control.stop("imap");
+        assert!(*rx.borrow(), "the accept loop must see true and break");
+    }
+
+    /// The legacy protocols stop; inbound SMTP and HTTPS do not (LP-1, LP-3).
+    #[test]
+    fn stop_matching_spares_inbound_and_http() {
+        let control = control();
+        let keep = vec!["smtp".to_string()];
+
+        let stopped = control.stop_matching(
+            |protocol, _ports| {
+                matches!(
+                    protocol,
+                    ServerProtocol::Imap
+                        | ServerProtocol::Pop3
+                        | ServerProtocol::ManageSieve
+                        | ServerProtocol::Smtp
+                )
+            },
+            &keep,
+        );
+
+        let mut stopped_ids: Vec<String> = stopped.into_iter().map(|l| l.id).collect();
+        stopped_ids.sort();
+        assert_eq!(stopped_ids, vec!["imap", "pop3", "sieve", "submission"]);
+
+        assert!(
+            control.is_running("smtp"),
+            "port 25 must never close (LP-3)"
+        );
+        assert!(control.is_running("https"), "JMAP must keep working");
+    }
+
+    /// Without `closeSubmission`, submission stays open and only the mail-app
+    /// protocols close (LP-1).
+    #[test]
+    fn stop_matching_can_leave_submission_open() {
+        let control = control();
+        let keep = vec!["smtp".to_string(), "submission".to_string()];
+
+        let stopped = control.stop_matching(
+            |protocol, _ports| {
+                matches!(
+                    protocol,
+                    ServerProtocol::Imap | ServerProtocol::Pop3 | ServerProtocol::ManageSieve
+                )
+            },
+            &keep,
+        );
+
+        assert_eq!(stopped.len(), 3);
+        assert!(control.is_running("submission"));
+        assert!(control.is_running("smtp"));
+    }
+
+    /// Whole-server shutdown still stops everything.
+    #[test]
+    fn stop_all_stops_everything() {
+        let control = control();
+        let rx = control.register("extra", ServerProtocol::Imap, vec![143]);
+
+        control.stop_all();
+
+        assert!(*rx.borrow());
+        assert!(control.running().is_empty());
+    }
+
+    /// `running` reports what is accepting, in a stable order.
+    #[test]
+    fn running_lists_what_accepts() {
+        let control = control();
+        control.stop("pop3");
+
+        let ids: Vec<String> = control.running().into_iter().map(|l| l.id).collect();
+        assert_eq!(ids, vec!["https", "imap", "sieve", "smtp", "submission"]);
+    }
+}

crates/common/src/network/dns/records.rs

@@ -2,9 +2,15 @@
  * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
  *
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ *
+ * Modified by Coffey Labs in 2026 for INBUXA.
  */
 
-use crate::{Server, config::network::Pacc, network::dkim::generate_dkim_dns_record};
+use crate::{
+    Server,
+    config::network::Pacc,
+    network::{dkim::generate_dkim_dns_record, legacy::is_legacy_service},
+};
 use ahash::{AHashMap, AHashSet};
 use base64::{Engine, engine::general_purpose};
 use dns_update::{
@@ -33,6 +39,8 @@ impl Server {
         let mut records = Vec::new();
         let network = &self.core.network;
         let default_host = network.server_name.as_str();
+        // inbuxa: legacy-protocols LP-7
+        let legacy_off = self.legacy_protocols_off().await?;
         let domain_name = domain.name.as_str();
         let domain_name_suffix = format!(".{domain_name}");
 
@@ -193,6 +201,25 @@ impl Server {
                             ServiceProtocol::Smtp => [("submission", 587), ("submissions", 465)],
                         };
 
+                        // inbuxa: legacy-protocols LP-7. While they are off, every
+                        // name says "not offered" -- target "." (RFC 6186 section
+                        // 3.4) -- rather than vanishing, so a client that looks
+                        // is told, and an old record left in the zone is replaced.
+                        if legacy_off && is_legacy_service(protocol) {
+                            for (service_name, _) in services {
+                                records.push(NamedDnsRecord {
+                                    name: format!("_{service_name}._tcp.{domain_name}."),
+                                    record: DnsRecord::SRV(SRVRecord {
+                                        target: ".".to_string(),
+                                        priority: 0,
+                                        weight: 0,
+                                        port: 0,
+                                    }),
+                                });
+                            }
+                            continue;
+                        }
+
                         for (is_tls, (service_name, port)) in services.into_iter().enumerate() {
                             if is_tls == 1 || service.cleartext {
                                 records.push(NamedDnsRecord {
@@ -277,6 +304,14 @@ impl Server {
                     for (protocol, service) in &network.info.services {
                         let hostname = service.hostname.as_deref().unwrap_or(default_host);
                         if hostname.ends_with(&domain_name_suffix) || hostname == domain_name {
+                            // inbuxa: legacy-protocols LP-7. No TLS pin for a port
+                            // the switch has closed. Submission's port stays open
+                            // (the SMTP lock), so its record stays.
+                            if legacy_off
+                                && matches!(protocol, ServiceProtocol::Imap | ServiceProtocol::Pop3)
+                            {
+                                continue;
+                            }
                             let port = match protocol {
                                 ServiceProtocol::Imap => 993,
                                 ServiceProtocol::Pop3 => 995,
@@ -382,6 +417,12 @@ impl Server {
     }
 
     pub async fn get_pacc_for_domain(&self, domain_name: &str) -> trc::Result<String> {
+        // inbuxa: legacy-protocols LP-7
+        let pacc = if self.legacy_protocols_off().await? {
+            &self.core.network.info.pacc_jmap_only
+        } else {
+            &self.core.network.info.pacc
+        };
         self.get_directory_for_domain(domain_name)
             .await
             .caused_by(trc::location!())
@@ -390,15 +431,9 @@ impl Server {
                     .and_then(|directory| {
                         directory
                             .oidc_discovery_document()
-                            .map(|doc| self.core.network.info.pacc.build(&doc.url))
+                            .map(|doc| pacc.build(&doc.url))
-                    })
-                    .unwrap_or_else(|| {
-                        self.core
-                            .network
-                            .info
-                            .pacc
-                            .build(&self.core.network.http.url_https)
                     })
+                    .unwrap_or_else(|| pacc.build(&self.core.network.http.url_https))
             })
     }
 }

crates/common/src/network/legacy.rs

@@ -0,0 +1,409 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Coffey Labs
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+//! Turning the legacy-protocols switch, and making it true of the running
+//! server (legacy-protocols spec, LP-1, LP-2 and LP-5).
+//!
+//! Two halves meet here. `inbuxa_features::security` decides what the policy
+//! means and owns the listener **objects**; [`ListenerControl`] owns the
+//! running **sockets**. Neither can do the job alone, and only `Server` has
+//! both, so the join lives here.
+//!
+//! Order matters in both directions. Closing removes the object first and then
+//! stops the socket: a socket stopped before its object is gone would come
+//! back on the next restart. Opening puts the object back first and then
+//! spawns, for the same reason in reverse.
+//!
+//! Sign-in is the second lock (LP-6): while the switch is off, a sign-in over
+//! a legacy protocol is refused before any password is looked at, so a
+//! listener that exists by mistake still lets nobody in.
+//!
+//! And nothing advertises what is closed (LP-7): client configuration and
+//! the suggested DNS records leave the legacy services out, or mark them as
+//! not offered, while the switch is off.
+//!
+//! Nothing here touches the host's firewall, NAT port-forwards or any proxy
+//! (LP-20). The server stops answering; what still routes the port is the
+//! operator's to reconcile.
+
+use crate::{Server, config::server::Listeners, network::TcpAcceptor};
+use directory::Credentials;
+use inbuxa_features::security::{
+    listeners,
+    protocol_policy::{self, ProtocolPolicy, SavedListener},
+};
+use registry::schema::enums::ServiceProtocol;
+use registry::types::{error::Error, id::ObjectId};
+use store::registry::bootstrap::Bootstrap;
+
+/// What turning the switch actually did.
+#[derive(Debug, Default)]
+pub struct PolicyChange {
+    /// Listeners removed and stopped (LP-1).
+    pub closed: Vec<SavedListener>,
+    /// Listeners put back and started again (LP-5).
+    pub reopened: Vec<SavedListener>,
+    /// Listeners that could not be put back, with the reason. Each stays
+    /// saved for another try (LP-5).
+    pub failed: Vec<(SavedListener, String)>,
+    /// Properties the locks overruled (LP-21).
+    pub overruled: Vec<&'static str>,
+    /// Listeners whose object is right but whose socket needs a restart,
+    /// because no spawner was left behind. Empty on a normally booted server.
+    pub pending_restart: Vec<String>,
+}
+
+impl PolicyChange {
+    /// Whether anything at all happened, for the caller deciding to emit
+    /// `security.legacy-protocols-changed` (LP-8).
+    pub fn is_empty(&self) -> bool {
+        self.closed.is_empty()
+            && self.reopened.is_empty()
+            && self.failed.is_empty()
+            && self.overruled.is_empty()
+    }
+}
+
+impl Server {
+    /// The policy in force.
+    pub async fn protocol_policy(&self) -> trc::Result<ProtocolPolicy> {
+        protocol_policy::get(&self.core.storage.data).await
+    }
+
+    /// Turns the switch, and makes it true of the running server.
+    ///
+    /// `requested` is what the client asked for; the locks are applied to it
+    /// first (LP-21), so what gets stored is what the server allows, not what
+    /// was asked. Returns what actually happened, for the response and the
+    /// event.
+    pub async fn set_protocol_policy(
+        &self,
+        requested: ProtocolPolicy,
+        changed_by: Option<String>,
+    ) -> trc::Result<PolicyChange> {
+        let mut policy = requested;
+        let mut change = PolicyChange {
+            overruled: policy.apply_locks(),
+            ..Default::default()
+        };
+
+        // Carry forward what earlier changes saved: the client never sets
+        // this, and a /set that omitted it must not lose the listeners still
+        // waiting to come back.
+        let previous = self.protocol_policy().await?;
+        policy.saved_listeners = previous.saved_listeners;
+        policy.changed_at = Some(store::write::now() * 1000);
+        policy.changed_by = changed_by;
+
+        if policy.legacy_protocols.is_disabled() {
+            self.close_legacy_listeners(&mut policy, &mut change).await?;
+        } else {
+            self.reopen_legacy_listeners(&mut policy, &mut change)
+                .await?;
+        }
+
+        protocol_policy::set(&self.core.storage.data, &policy).await?;
+
+        Ok(change)
+    }
+
+    /// Removes the listener objects the policy closes, then stops their
+    /// sockets (LP-1, LP-2).
+    async fn close_legacy_listeners(
+        &self,
+        policy: &mut ProtocolPolicy,
+        change: &mut PolicyChange,
+    ) -> trc::Result<()> {
+        let removed = listeners::close(self.registry(), policy).await?;
+
+        for saved in &removed {
+            // The runtime registry is keyed by the listener's name, which is
+            // what `close` returns as the saved listener's id.
+            self.inner.data.listener_control.stop(&saved.id);
+        }
+
+        policy.saved_listeners.extend(removed.iter().cloned());
+        change.closed = removed;
+
+        Ok(())
+    }
+
+    /// Puts back every saved listener and starts it again (LP-5).
+    async fn reopen_legacy_listeners(
+        &self,
+        policy: &mut ProtocolPolicy,
+        change: &mut PolicyChange,
+    ) -> trc::Result<()> {
+        if policy.saved_listeners.is_empty() {
+            return Ok(());
+        }
+
+        let saved = std::mem::take(&mut policy.saved_listeners);
+        let (restored, failed) = listeners::reopen(self.registry(), &saved).await?;
+
+        // A listener that could not be put back stays saved for another try.
+        policy.saved_listeners = failed.iter().map(|(listener, _)| listener.clone()).collect();
+        change.failed = failed;
+
+        if !restored.is_empty() {
+            change.pending_restart = self.spawn_restored_listeners(&restored).await?;
+        }
+        change.reopened = restored;
+
+        Ok(())
+    }
+
+    /// Binds and spawns the listeners just put back, so a port opens without a
+    /// restart. Returns the names that still need one.
+    async fn spawn_restored_listeners(&self, restored: &[SavedListener]) -> trc::Result<Vec<String>> {
+        let control = &self.inner.data.listener_control;
+        if !control.can_spawn() {
+            return Ok(restored.iter().map(|listener| listener.id.clone()).collect());
+        }
+
+        // Re-parse from the registry rather than from the saved object: the
+        // socket has to be created and bound afresh, and the parser is what
+        // knows how. The objects are already back, so this sees them.
+        let mut bootstrap = Bootstrap::new(self.registry().clone()).await;
+        let mut parsed = Listeners::parse(&mut bootstrap).await;
+        parsed
+            .parse_tcp_acceptors(&mut bootstrap, self.inner.clone())
+            .await;
+
+        // Only the wanted listeners, so re-parsing does not bind a port some
+        // other listener already holds.
+        let wanted: Vec<&str> = restored.iter().map(|l| l.id.as_str()).collect();
+        parsed
+            .servers
+            .retain(|listener| wanted.contains(&listener.id.as_str()));
+
+        // Bind, but do not drop privileges again. A port below 1024 fails
+        // here once privileges are gone; that listener is reported as needing
+        // a restart rather than quietly left dead.
+        let errors_before = bootstrap.errors.len();
+        parsed.bind(&mut bootstrap);
+        let unbindable: Vec<ObjectId> = bootstrap.errors[errors_before..]
+            .iter()
+            .filter_map(|error| match error {
+                Error::Build { object_id, .. } => Some(*object_id),
+                _ => None,
+            })
+            .collect();
+        parsed
+            .servers
+            .retain(|listener| !unbindable.contains(&listener.registry_id));
+
+        let mut spawned = Vec::new();
+
+        let mut acceptors = std::mem::take(&mut parsed.tcp_acceptors);
+        for listener in parsed.servers {
+            if !wanted.contains(&listener.id.as_str()) || control.is_running(&listener.id) {
+                continue;
+            }
+            let acceptor = acceptors
+                .remove(&listener.id)
+                .unwrap_or(TcpAcceptor::Plain);
+            let id = listener.id.clone();
+            if control.spawn(listener, acceptor) {
+                spawned.push(id);
+            }
+        }
+
+        Ok(restored
+            .iter()
+            .map(|listener| listener.id.clone())
+            .filter(|id| !spawned.contains(id))
+            .collect())
+    }
+}
+
+/// A protocol a mail app signs in over, which the switch refuses (LP-6).
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum LegacyProtocol {
+    Imap,
+    Pop3,
+    ManageSieve,
+    /// SMTP AUTH, on any SMTP listener: only mail apps authenticate, so
+    /// inbound delivery is untouched (LP-3).
+    Submission,
+}
+
+impl LegacyProtocol {
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            LegacyProtocol::Imap => "imap",
+            LegacyProtocol::Pop3 => "pop3",
+            LegacyProtocol::ManageSieve => "manageSieve",
+            LegacyProtocol::Submission => "submission",
+        }
+    }
+
+    /// What the mail app is told, at server scope (LP-12, LP-6). Each
+    /// protocol's own framing — IMAP's `[ALERT]`, ManageSieve's quoting —
+    /// is added by its session; POP3 carries `[AUTH]` in the text, since its
+    /// errors have no separate code, and SMTP is the whole reply line.
+    pub fn refusal(&self) -> &'static str {
+        match self {
+            LegacyProtocol::Imap => {
+                "This server allows only INBUXA webmail and JMAP apps. This mail app can't sign in."
+            }
+            LegacyProtocol::Pop3 => {
+                "[AUTH] This server allows only INBUXA webmail and JMAP apps. This mail app can't sign in."
+            }
+            LegacyProtocol::ManageSieve => "This server allows only INBUXA webmail and JMAP apps.",
+            LegacyProtocol::Submission => {
+                "535 5.7.0 This server allows only INBUXA webmail and JMAP apps. This mail app can't send.\r\n"
+            }
+        }
+    }
+
+    /// The refusal as an error: `auth.legacy-protocol-refused`, not
+    /// `auth.failed`, so it never counts against the account or feeds the
+    /// auto-ban (LP-11). It names the protocol and the domain, never the
+    /// account; the session it is raised in adds the remote IP.
+    pub fn refused(&self, credentials: &Credentials) -> trc::Error {
+        trc::AuthEvent::LegacyProtocolRefused
+            .into_err()
+            .details(self.refusal())
+            .ctx(trc::Key::Source, self.as_str())
+            .ctx(trc::Key::Policy, "server")
+            .ctx_opt(trc::Key::Domain, domain_of(credentials))
+    }
+}
+
+/// The domain a sign-in is for, from the name it gives, if it gives one.
+fn domain_of(credentials: &Credentials) -> Option<String> {
+    let username = match credentials {
+        Credentials::Basic { username, .. } => Some(username.as_str()),
+        Credentials::Bearer { username, .. } => username.as_deref(),
+    }?;
+    username
+        .rsplit_once('@')
+        .map(|(_, domain)| domain.trim().to_lowercase())
+        .filter(|domain| !domain.is_empty())
+}
+
+impl Server {
+    /// Refuses a sign-in over a legacy protocol while the server-wide switch
+    /// is off (LP-6). Called before the credentials are checked, so the
+    /// answer is the same for a right password, a wrong one and an account
+    /// that doesn't exist (LP-11).
+    ///
+    /// Read from the store on each sign-in rather than cached, so every node
+    /// of a cluster answers the same the moment the switch turns.
+    pub async fn refuse_legacy_sign_in(
+        &self,
+        protocol: LegacyProtocol,
+        credentials: &Credentials,
+    ) -> trc::Result<()> {
+        if self.protocol_policy().await?.legacy_protocols.is_disabled() {
+            Err(protocol.refused(credentials))
+        } else {
+            Ok(())
+        }
+    }
+}
+
+/// The services mail apps sign in to, which the switch turns off: nothing may
+/// offer them while it is (LP-7). SMTP here is submission -- mail apps
+/// sending -- since inbound mail is never a configured service.
+pub fn is_legacy_service(protocol: &ServiceProtocol) -> bool {
+    matches!(
+        protocol,
+        ServiceProtocol::Imap
+            | ServiceProtocol::Pop3
+            | ServiceProtocol::Smtp
+            | ServiceProtocol::Managesieve
+    )
+}
+
+impl Server {
+    /// Whether the server-wide switch is off, for the answers that must stop
+    /// offering legacy services (LP-7). Read per answer, as sign-in reads it.
+    pub async fn legacy_protocols_off(&self) -> trc::Result<bool> {
+        Ok(self.protocol_policy().await?.legacy_protocols.is_disabled())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn basic(username: &str) -> Credentials {
+        Credentials::Basic {
+            username: username.to_string(),
+            secret: "wrong or right, it is never read".to_string(),
+            mfa_token: None,
+        }
+    }
+
+    #[test]
+    fn refusals_read_as_the_spec_writes_them() {
+        // LP-12, with "Your organization" read as "This server" (LP-6).
+        assert_eq!(
+            LegacyProtocol::Imap.refusal(),
+            "This server allows only INBUXA webmail and JMAP apps. This mail app can't sign in."
+        );
+        assert!(
+            LegacyProtocol::Pop3
+                .refusal()
+                .starts_with("[AUTH] This server allows")
+        );
+        assert_eq!(
+            LegacyProtocol::ManageSieve.refusal(),
+            "This server allows only INBUXA webmail and JMAP apps."
+        );
+        assert_eq!(
+            LegacyProtocol::Submission.refusal(),
+            "535 5.7.0 This server allows only INBUXA webmail and JMAP apps. This mail app can't send.\r\n"
+        );
+    }
+
+    #[test]
+    fn a_refusal_is_not_a_failed_sign_in() {
+        let err = LegacyProtocol::Imap.refused(&basic("[email protected]"));
+        assert!(err.matches(trc::EventType::Auth(trc::AuthEvent::LegacyProtocolRefused)));
+        assert!(!err.matches(trc::EventType::Auth(trc::AuthEvent::Failed)));
+        // The session stays open: the mail app is told, not thrown off.
+        assert!(!err.must_disconnect());
+        assert!(err.should_write_err());
+        assert_eq!(err.value_as_str(trc::Key::Domain), Some("example.org"));
+        assert_eq!(err.value_as_str(trc::Key::Source), Some("imap"));
+        assert_eq!(err.value_as_str(trc::Key::AccountName), None);
+    }
+
+    #[test]
+    fn only_the_services_mail_apps_sign_in_to_are_legacy() {
+        for protocol in [
+            ServiceProtocol::Imap,
+            ServiceProtocol::Pop3,
+            ServiceProtocol::Smtp,
+            ServiceProtocol::Managesieve,
+        ] {
+            assert!(is_legacy_service(&protocol), "{protocol:?}");
+        }
+        for protocol in [
+            ServiceProtocol::Jmap,
+            ServiceProtocol::Caldav,
+            ServiceProtocol::Carddav,
+            ServiceProtocol::Webdav,
+        ] {
+            assert!(!is_legacy_service(&protocol), "{protocol:?}");
+        }
+    }
+
+    #[test]
+    fn the_domain_comes_from_the_name_given() {
+        assert_eq!(domain_of(&basic("[email protected]")), Some("b.test".to_string()));
+        assert_eq!(domain_of(&basic("no-domain")), None);
+        assert_eq!(domain_of(&basic("trailing@")), None);
+        let bearer = Credentials::Bearer {
+            username: None,
+            token: "t".to_string(),
+        };
+        assert_eq!(domain_of(&bearer), None);
+    }
+}

crates/common/src/network/listen.rs

@@ -26,6 +26,8 @@ use tokio_rustls::server::TlsStream;
 use trc::{EventType, HttpEvent, ImapEvent, ManageSieveEvent, Pop3Event, SmtpEvent};
 use utils::UnwrapFailure;
 
+use super::control::ListenerControl;
+
 impl Listener {
     pub fn spawn(
         self,
@@ -324,8 +326,14 @@ impl SocketOpts {
 }
 
 impl Listeners {
-    pub fn bind_and_drop_priv(&self, bp: &mut Bootstrap) {
+    /// Binds every socket, reporting each failure against its listener.
-        // Bind as root
+    ///
+    /// Split out of [`Listeners::bind_and_drop_priv`] so a listener can be
+    /// bound again at runtime, when the legacy-protocols switch puts one back
+    /// (LP-5), without dropping privileges a second time. A port below 1024
+    /// will fail here once privileges are gone, which is one of the cases
+    /// LP-5 expects and reports rather than hides.
+    pub fn bind(&self, bp: &mut Bootstrap) {
         for server in &self.servers {
             for listener in &server.listeners {
                 if let Err(err) = listener.socket.bind(listener.addr) {
@@ -336,6 +344,11 @@ impl Listeners {
                 }
             }
         }
+    }
+
+    pub fn bind_and_drop_priv(&self, bp: &mut Bootstrap) {
+        // Bind as root
+        self.bind(bp);
 
         // Drop privileges
         #[cfg(not(target_env = "msvc"))]
@@ -370,6 +383,38 @@ impl Listeners {
         }
         (shutdown_tx, shutdown_rx)
     }
+
+    /// As [`Listeners::spawn`], but each listener gets its own shutdown
+    /// channel, registered in `control` under the listener's id, so one can be
+    /// stopped without touching the others (legacy-protocols LP-2).
+    ///
+    /// The returned sender no longer reaches the listeners: whole-server
+    /// shutdown must also call [`ListenerControl::stop_all`]. `control` has to
+    /// outlive the listeners, because it owns the sending ends — dropping it
+    /// would stop every listener at once.
+    pub fn spawn_with_control(
+        mut self,
+        control: &ListenerControl,
+        spawn: impl Fn(Listener, TcpAcceptor, watch::Receiver<bool>),
+    ) -> (watch::Sender<bool>, watch::Receiver<bool>) {
+        let (shutdown_tx, shutdown_rx) = watch::channel(false);
+        for server in self.servers {
+            let acceptor = self
+                .tcp_acceptors
+                .remove(&server.id)
+                .unwrap_or(TcpAcceptor::Plain);
+
+            let ports = server
+                .listeners
+                .iter()
+                .map(|listener| listener.addr.port())
+                .collect();
+            let listener_rx = control.register(server.id.clone(), server.protocol, ports);
+
+            spawn(server, acceptor, listener_rx);
+        }
+        (shutdown_tx, shutdown_rx)
+    }
 }
 
 impl TcpListener {

crates/common/src/network/mod.rs

@@ -33,8 +33,10 @@ use utils::snowflake::SnowflakeIdGenerator;
 pub mod acme;
 pub mod asn;
 pub mod autoconfig;
+pub mod control;
 pub mod dkim;
 pub mod dns;
+pub mod legacy;
 pub mod limiter;
 pub mod listen;
 pub mod mta;

crates/features/src/lib.rs

@@ -21,5 +21,6 @@
 pub mod ai;
 pub mod branding;
 pub mod masked_email;
+pub mod security;
 pub mod tenancy;
 pub mod undelete;

crates/features/src/security/listeners.rs

@@ -0,0 +1,297 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Coffey Labs
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+//! Taking the legacy listeners away and putting them back (legacy-protocols
+//! spec, LP-1 and LP-5).
+//!
+//! The switch removes the listener **objects**, not just their sockets. A
+//! stopped socket comes back on the next restart, which would reopen every
+//! port the operator just closed; a removed object does not. It also means a
+//! server that boots with the switch on never spawns them in the first place,
+//! with no boot-time special case.
+//!
+//! Each removed object is kept whole in the policy so LP-5 can put it back
+//! exactly as it was. Closing the running socket is a separate step, and lives
+//! in `common`, which owns the listener registry: this crate sits below it.
+//!
+//! None of this touches the host's firewall or any port-forward (LP-20).
+
+use crate::security::protocol_policy::{ProtocolPolicy, SavedListener};
+use registry::schema::{
+    enums::NetworkListenerProtocol,
+    prelude::Object,
+    structs::NetworkListener,
+};
+use store::{
+    RegistryStore,
+    registry::write::{RegistryWrite, RegistryWriteResult},
+};
+use trc::AddContext;
+
+/// How the registry schema spells a listener's protocol. These are the strings
+/// [`ProtocolPolicy::closes`] matches on.
+pub fn protocol_name(protocol: NetworkListenerProtocol) -> &'static str {
+    match protocol {
+        NetworkListenerProtocol::Smtp => "smtp",
+        NetworkListenerProtocol::Lmtp => "lmtp",
+        NetworkListenerProtocol::Http => "http",
+        NetworkListenerProtocol::Imap => "imap",
+        NetworkListenerProtocol::Pop3 => "pop3",
+        NetworkListenerProtocol::ManageSieve => "manageSieve",
+    }
+}
+
+/// Every port a listener binds. A listener may bind several, and one of them
+/// being 25 makes the whole listener inbound (LP-3).
+pub fn ports(listener: &NetworkListener) -> Vec<u16> {
+    listener.bind.iter().map(|addr| addr.0.port()).collect()
+}
+
+/// Whether the policy closes this listener.
+pub fn closes(policy: &ProtocolPolicy, listener: &NetworkListener) -> bool {
+    policy.closes(protocol_name(listener.protocol), &ports(listener))
+}
+
+/// Saves a listener whole, ready to be put back (LP-5).
+fn save(listener: &NetworkListener) -> trc::Result<SavedListener> {
+    Ok(SavedListener {
+        id: listener.name.clone(),
+        protocol: protocol_name(listener.protocol).to_string(),
+        ports: ports(listener),
+        object: serde_json::to_value(listener).map_err(|err| {
+            trc::StoreEvent::UnexpectedError
+                .caused_by(trc::location!())
+                .reason(err)
+        })?,
+    })
+}
+
+/// Removes every listener the policy closes, saving each one whole first
+/// (LP-1). Returns what was removed, in the order the registry listed it.
+///
+/// The caller then stops the matching running sockets, by the `id` of each
+/// returned listener — which is the listener's name, the same key the runtime
+/// registry uses.
+pub async fn close(
+    registry: &RegistryStore,
+    policy: &ProtocolPolicy,
+) -> trc::Result<Vec<SavedListener>> {
+    let mut removed = Vec::new();
+
+    for listener in registry
+        .list::<NetworkListener>()
+        .await
+        .caused_by(trc::location!())?
+    {
+        if !closes(policy, &listener.object) {
+            continue;
+        }
+
+        let saved = save(&listener.object)?;
+        match registry
+            .write(RegistryWrite::delete(listener.id))
+            .await
+            .caused_by(trc::location!())?
+        {
+            RegistryWriteResult::Success(_) | RegistryWriteResult::NotFound { .. } => {
+                removed.push(saved);
+            }
+            // Anything else means the registry declined the delete. Leave the
+            // listener alone and say nothing was removed, so the policy does
+            // not claim a port is closed while it is still accepting.
+            _ => {}
+        }
+    }
+
+    Ok(removed)
+}
+
+/// Puts back every saved listener (LP-5).
+///
+/// Returns the ones restored and the ones that could not be, each with the
+/// reason. A listener that cannot come back — its port taken in the meantime,
+/// say — does not stop the others, and stays saved for another try.
+pub async fn reopen(
+    registry: &RegistryStore,
+    saved: &[SavedListener],
+) -> trc::Result<(Vec<SavedListener>, Vec<(SavedListener, String)>)> {
+    let mut restored = Vec::new();
+    let mut failed = Vec::new();
+
+    for listener in saved {
+        let object: NetworkListener = match serde_json::from_value(listener.object.clone()) {
+            Ok(object) => object,
+            Err(err) => {
+                failed.push((listener.clone(), format!("saved listener unreadable: {err}")));
+                continue;
+            }
+        };
+
+        let object: Object = object.into();
+        match registry
+            .write(RegistryWrite::insert(&object))
+            .await
+            .caused_by(trc::location!())?
+        {
+            RegistryWriteResult::Success(_) => restored.push(listener.clone()),
+            other => failed.push((listener.clone(), format!("{other:?}"))),
+        }
+    }
+
+    Ok((restored, failed))
+}
+
+/// The listener objects that exist right now, as `(name, protocol, ports)`.
+/// The confirmation (LP-16) lists exactly what will close, before anything
+/// happens.
+pub async fn would_close(
+    registry: &RegistryStore,
+    policy: &ProtocolPolicy,
+) -> trc::Result<Vec<SavedListener>> {
+    let mut out = Vec::new();
+    for listener in registry
+        .list::<NetworkListener>()
+        .await
+        .caused_by(trc::location!())?
+    {
+        if closes(policy, &listener.object) {
+            out.push(save(&listener.object)?);
+        }
+    }
+    Ok(out)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::security::protocol_policy::LegacyProtocols;
+    use registry::{schema::prelude::SocketAddr, types::map::Map};
+    use std::str::FromStr;
+
+    fn listener(name: &str, protocol: NetworkListenerProtocol, binds: &[&str]) -> NetworkListener {
+        NetworkListener {
+            name: name.to_string(),
+            protocol,
+            bind: Map::new(
+                binds
+                    .iter()
+                    .map(|addr| SocketAddr::from_str(addr).unwrap())
+                    .collect::<Vec<_>>(),
+            ),
+            ..Default::default()
+        }
+    }
+
+    fn disabled() -> ProtocolPolicy {
+        ProtocolPolicy {
+            legacy_protocols: LegacyProtocols::Disabled,
+            ..Default::default()
+        }
+    }
+
+    /// The protocol names match what the policy matches on.
+    #[test]
+    fn protocol_names_are_the_schema_spelling() {
+        assert_eq!(protocol_name(NetworkListenerProtocol::Imap), "imap");
+        assert_eq!(protocol_name(NetworkListenerProtocol::Pop3), "pop3");
+        assert_eq!(
+            protocol_name(NetworkListenerProtocol::ManageSieve),
+            "manageSieve"
+        );
+        assert_eq!(protocol_name(NetworkListenerProtocol::Smtp), "smtp");
+    }
+
+    /// Every bound port is seen, so a listener that also binds 25 is caught.
+    #[test]
+    fn every_bound_port_is_seen() {
+        let l = listener(
+            "mixed",
+            NetworkListenerProtocol::Smtp,
+            &["[::]:465", "0.0.0.0:25"],
+        );
+        let mut p = ports(&l);
+        p.sort();
+        assert_eq!(p, vec![25, 465]);
+    }
+
+    /// The mail-app listeners close; inbound and JMAP do not (LP-1, LP-3).
+    #[test]
+    fn the_right_listeners_close() {
+        let policy = disabled();
+
+        for (name, protocol, binds) in [
+            ("imaps", NetworkListenerProtocol::Imap, &["[::]:993"][..]),
+            ("pop3s", NetworkListenerProtocol::Pop3, &["[::]:995"][..]),
+            (
+                "sieve",
+                NetworkListenerProtocol::ManageSieve,
+                &["[::]:4190"][..],
+            ),
+        ] {
+            assert!(
+                closes(&policy, &listener(name, protocol, binds)),
+                "{name} should close"
+            );
+        }
+
+        for (name, protocol, binds) in [
+            ("smtp", NetworkListenerProtocol::Smtp, &["[::]:25"][..]),
+            // Locked whole, so submission stays too (LP-21).
+            (
+                "submissions",
+                NetworkListenerProtocol::Smtp,
+                &["[::]:465"][..],
+            ),
+            ("https", NetworkListenerProtocol::Http, &["[::]:443"][..]),
+            ("lmtp", NetworkListenerProtocol::Lmtp, &["[::]:11200"][..]),
+        ] {
+            assert!(
+                !closes(&policy, &listener(name, protocol, binds)),
+                "{name} must stay"
+            );
+        }
+    }
+
+    /// A submission listener that also binds 25 is inbound, and stays (LP-3).
+    /// Kept so LP-3 stays covered if the LP-21 lock is ever lifted.
+    #[test]
+    fn a_listener_that_also_binds_25_stays() {
+        let policy = disabled();
+        let l = listener(
+            "mixed",
+            NetworkListenerProtocol::Smtp,
+            &["[::]:465", "[::]:25"],
+        );
+        assert!(!closes(&policy, &l));
+    }
+
+    /// A saved listener keeps every field, including ones this code never
+    /// reads, and comes back as the same object (LP-5).
+    #[test]
+    fn a_saved_listener_round_trips() {
+        let mut original = listener("imaps", NetworkListenerProtocol::Imap, &["[::]:993"]);
+        original.socket_no_delay = true;
+        original.socket_backlog = Some(2048);
+
+        let saved = save(&original).unwrap();
+        assert_eq!(saved.id, "imaps");
+        assert_eq!(saved.protocol, "imap");
+        assert_eq!(saved.ports, vec![993]);
+
+        let back: NetworkListener = serde_json::from_value(saved.object).unwrap();
+        assert_eq!(back, original);
+    }
+
+    /// While the switch is off, nothing closes.
+    #[test]
+    fn enabled_closes_nothing() {
+        let policy = ProtocolPolicy::default();
+        assert!(!closes(
+            &policy,
+            &listener("imaps", NetworkListenerProtocol::Imap, &["[::]:993"])
+        ));
+    }
+}

crates/features/src/security/mod.rs

@@ -0,0 +1,14 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Coffey Labs
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+//! Security hardening INBUXA adds of its own.
+//!
+//! Unlike the rest of this crate, these are not rebuilds of anything upstream
+//! ships. The legacy-protocols switch is INBUXA's own design, specified in
+//! `legacy-protocols.md`.
+
+pub mod listeners;
+pub mod protocol_policy;

crates/features/src/security/protocol_policy.rs

@@ -0,0 +1,427 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Coffey Labs
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+//! `inbuxa:ProtocolPolicy`, the server-wide legacy mail protocols switch
+//! (legacy-protocols spec, data model and LP-1 to LP-8). Stored as JSON under
+//! `P` + `p` in the fork's subspace; unset fields read as the defaults.
+//!
+//! This module is the fact, not the act. It holds what the operator chose and
+//! which listeners were taken away to honour it. Closing sockets belongs to
+//! `common`, which owns the listener registry, and removing the listener
+//! objects belongs to the caller that has the registry to hand: this crate
+//! sits below both.
+
+use serde::{Deserialize as SerdeDeserialize, Serialize as SerdeSerialize};
+use store::{
+    Deserialize, SUBSPACE_INBUXA, Store, ValueKey,
+    write::{AnyClass, BatchBuilder, ValueClass},
+};
+use trc::AddContext;
+
+/// Whether the legacy mail protocols may be used at all.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default, SerdeSerialize, SerdeDeserialize)]
+#[serde(rename_all = "camelCase")]
+pub enum LegacyProtocols {
+    /// IMAP, POP3, ManageSieve and SMTP submission work as configured.
+    #[default]
+    Enabled,
+    /// They are off: the ports are closed and sign-in over them is refused.
+    Disabled,
+}
+
+impl LegacyProtocols {
+    pub fn is_disabled(&self) -> bool {
+        matches!(self, LegacyProtocols::Disabled)
+    }
+}
+
+/// A listener taken away to honour the switch, kept whole so it can be put
+/// back exactly as it was (LP-1, LP-5).
+///
+/// `object` is the listener's registry object verbatim. Keeping the whole
+/// object rather than a few fields is what lets LP-5 promise "exactly the
+/// saved listeners": a listener has proxy networks, TLS timeouts and socket
+/// options that nobody should have to re-derive, and a field this code has
+/// never heard of must survive the round trip too.
+#[derive(Debug, Clone, PartialEq, SerdeSerialize, SerdeDeserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SavedListener {
+    /// The listener's name, as the operator knows it.
+    pub id: String,
+    /// `imap`, `pop3`, `manageSieve` or `smtp`, as the registry spells it.
+    pub protocol: String,
+    /// The ports it was accepting on, for the confirmation's list (LP-16).
+    pub ports: Vec<u16>,
+    /// The registry object, whole.
+    pub object: serde_json::Value,
+}
+
+/// The server-wide switch.
+#[derive(Debug, Clone, PartialEq, SerdeSerialize, SerdeDeserialize)]
+#[serde(rename_all = "camelCase", default)]
+pub struct ProtocolPolicy {
+    /// The switch itself.
+    pub legacy_protocols: LegacyProtocols,
+    /// With `disabled`, also close SMTP submission (LP-3). The inbound
+    /// listener on port 25 is never closed, whatever this says.
+    pub close_submission: bool,
+    /// The listeners removed when the switch went off (LP-1), for LP-5.
+    pub saved_listeners: Vec<SavedListener>,
+    /// When the switch last changed, in milliseconds since the epoch.
+    pub changed_at: Option<u64>,
+    /// The account that last changed it.
+    pub changed_by: Option<String>,
+}
+
+impl Default for ProtocolPolicy {
+    fn default() -> Self {
+        ProtocolPolicy {
+            legacy_protocols: LegacyProtocols::Enabled,
+            close_submission: true,
+            saved_listeners: Vec::new(),
+            changed_at: None,
+            changed_by: None,
+        }
+    }
+}
+
+/// The properties `inbuxa:ProtocolPolicy` has, as they appear over JMAP.
+pub const PROPERTIES: &[&str] = &[
+    "legacyProtocols",
+    "closeSubmission",
+    "savedListeners",
+    "changedAt",
+    "changedBy",
+];
+
+/// The registry protocols the switch closes, as the schema spells them.
+///
+/// `smtp` is deliberately absent: an SMTP listener is submission or inbound
+/// depending on its port, which only the caller can tell (LP-3).
+pub const LEGACY_PROTOCOLS: &[&str] = &["imap", "pop3", "manageSieve"];
+
+/// The port that always means inbound mail, and is never closed (LP-3).
+pub const INBOUND_SMTP_PORT: u16 = 25;
+
+/// Protocols the switch may never close, whatever is asked of it (LP-21).
+///
+/// `http` carries JMAP, so closing it would lock every account out of its mail
+/// and the operator out of INBUXA Admin. `smtp` is locked whole — inbound and
+/// submission alike — by John's decision of 2026-09-20; LP-3 already spared
+/// inbound, and this extends it to 465 and 587. `lmtp` is internal and was
+/// never a candidate.
+///
+/// Locking submission costs the feature nothing: the ports stay open and
+/// sign-in over them is still refused (LP-6), which is the case acceptance
+/// test 2 already describes.
+///
+/// The front ends read this list rather than carry their own copy, so
+/// unlocking later is a server change and no admin release.
+pub const LOCKED_PROTOCOLS: &[&str] = &["smtp", "lmtp", "http"];
+
+/// Whether this protocol is locked open (LP-21).
+pub fn is_locked(protocol: &str) -> bool {
+    LOCKED_PROTOCOLS
+        .iter()
+        .any(|locked| locked.eq_ignore_ascii_case(protocol))
+}
+
+impl ProtocolPolicy {
+    /// Whether a listener of this protocol and these ports is one the switch
+    /// closes. A listener bound to port 25 is inbound whatever its name, and
+    /// any other SMTP listener counts as submission (LP-3).
+    pub fn closes(&self, protocol: &str, ports: &[u16]) -> bool {
+        if !self.legacy_protocols.is_disabled() {
+            return false;
+        }
+        // The lock is checked first and answers for every caller, so no
+        // request phrasing can reach past it (LP-21).
+        if is_locked(protocol) {
+            return false;
+        }
+        if LEGACY_PROTOCOLS.contains(&protocol) {
+            return true;
+        }
+        protocol.eq_ignore_ascii_case("smtp")
+            && self.close_submission
+            && !ports.contains(&INBOUND_SMTP_PORT)
+    }
+
+    /// Applies the locks to what a client asked for, returning what was
+    /// overruled so the response can say so (LP-21).
+    ///
+    /// `closeSubmission` is recorded and ignored rather than refused: the
+    /// field is specified, and the lock is meant to be temporary.
+    pub fn apply_locks(&mut self) -> Vec<&'static str> {
+        let mut overruled = Vec::new();
+        if self.close_submission && is_locked("smtp") {
+            self.close_submission = false;
+            overruled.push("closeSubmission");
+        }
+        overruled
+    }
+
+    /// Whether creating a listener of this protocol is refused right now
+    /// (LP-4), so a closed port cannot be quietly reopened.
+    pub fn refuses_new_listener(&self, protocol: &str, ports: &[u16]) -> bool {
+        self.closes(protocol, ports)
+    }
+
+    /// What's wrong with these values, naming the property.
+    pub fn check(&self) -> Result<(), (&'static str, String)> {
+        if self.saved_listeners.len() > 1024 {
+            return Err((
+                "savedListeners",
+                "must hold at most 1024 listeners".to_string(),
+            ));
+        }
+        for saved in &self.saved_listeners {
+            if saved.id.is_empty() {
+                return Err(("savedListeners", "a saved listener has no id".to_string()));
+            }
+        }
+        Ok(())
+    }
+}
+
+fn key() -> ValueClass {
+    ValueClass::Any(AnyClass {
+        subspace: SUBSPACE_INBUXA,
+        key: b"Pp".to_vec(),
+    })
+}
+
+struct Json(ProtocolPolicy);
+
+impl Deserialize for Json {
+    fn deserialize(bytes: &[u8]) -> trc::Result<Self> {
+        serde_json::from_slice(bytes).map(Json).map_err(|err| {
+            trc::StoreEvent::DataCorruption
+                .caused_by(trc::location!())
+                .reason(err)
+        })
+    }
+}
+
+/// The policy in force.
+pub async fn get(data: &Store) -> trc::Result<ProtocolPolicy> {
+    Ok(data
+        .get_value::<Json>(ValueKey::from(key()))
+        .await
+        .caused_by(trc::location!())?
+        .map(|Json(policy)| policy)
+        .unwrap_or_default())
+}
+
+/// Stores a new policy.
+pub async fn set(data: &Store, policy: &ProtocolPolicy) -> trc::Result<()> {
+    let bytes = serde_json::to_vec(policy).map_err(|err| {
+        trc::StoreEvent::UnexpectedError
+            .caused_by(trc::location!())
+            .reason(err)
+    })?;
+    let mut batch = BatchBuilder::new();
+    batch.set(key(), bytes);
+    data.write(batch.build_all())
+        .await
+        .caused_by(trc::location!())
+        .map(|_| ())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn disabled() -> ProtocolPolicy {
+        ProtocolPolicy {
+            legacy_protocols: LegacyProtocols::Disabled,
+            ..Default::default()
+        }
+    }
+
+    /// The default is on, and every property survives the round trip.
+    #[test]
+    fn defaults_and_partial_json() {
+        let policy = ProtocolPolicy::default();
+        assert_eq!(policy.legacy_protocols, LegacyProtocols::Enabled);
+        assert!(policy.close_submission);
+        assert!(policy.check().is_ok());
+
+        let partial: ProtocolPolicy =
+            serde_json::from_str(r#"{"legacyProtocols": "disabled"}"#).unwrap();
+        assert!(partial.legacy_protocols.is_disabled());
+        assert!(
+            partial.close_submission,
+            "an unset closeSubmission reads as the default, true"
+        );
+
+        let json = serde_json::to_value(&policy).unwrap();
+        for property in PROPERTIES {
+            assert!(json.get(property).is_some(), "{property}");
+        }
+        assert_eq!(json["legacyProtocols"], "enabled");
+    }
+
+    /// While the switch is on, nothing closes (LP-1).
+    #[test]
+    fn enabled_closes_nothing() {
+        let policy = ProtocolPolicy::default();
+        for (protocol, ports) in [
+            ("imap", vec![993]),
+            ("pop3", vec![995]),
+            ("manageSieve", vec![4190]),
+            ("smtp", vec![465]),
+            ("smtp", vec![25]),
+        ] {
+            assert!(!policy.closes(protocol, &ports), "{protocol} {ports:?}");
+        }
+    }
+
+    /// The mail-app protocols close. Submission does not, while SMTP is
+    /// locked (LP-1, LP-21).
+    #[test]
+    fn disabled_closes_the_legacy_protocols() {
+        let policy = disabled();
+        assert!(policy.closes("imap", &[993]));
+        assert!(policy.closes("pop3", &[995]));
+        assert!(policy.closes("manageSieve", &[4190]));
+        assert!(!policy.closes("smtp", &[465]), "SMTP is locked (LP-21)");
+        assert!(!policy.closes("smtp", &[587]), "SMTP is locked (LP-21)");
+    }
+
+    /// SMTP and JMAP cannot be closed, however the question is put (LP-21).
+    #[test]
+    fn smtp_and_jmap_are_locked() {
+        assert!(is_locked("smtp"));
+        assert!(is_locked("SMTP"), "the lock ignores case");
+        assert!(is_locked("http"));
+        assert!(is_locked("lmtp"));
+        assert!(!is_locked("imap"));
+        assert!(!is_locked("pop3"));
+        assert!(!is_locked("manageSieve"));
+
+        // Even asked for directly, with closeSubmission set by hand.
+        let forced = ProtocolPolicy {
+            legacy_protocols: LegacyProtocols::Disabled,
+            close_submission: true,
+            ..Default::default()
+        };
+        for ports in [vec![465], vec![587], vec![25], vec![2525]] {
+            assert!(!forced.closes("smtp", &ports), "smtp {ports:?}");
+        }
+        assert!(!forced.closes("http", &[443]));
+    }
+
+    /// A client asking to close submission is overruled, not refused, and the
+    /// overrule is reported (LP-21, acceptance test 18).
+    #[test]
+    fn close_submission_is_overruled_and_reported() {
+        let mut policy = ProtocolPolicy {
+            legacy_protocols: LegacyProtocols::Disabled,
+            close_submission: true,
+            ..Default::default()
+        };
+
+        let overruled = policy.apply_locks();
+        assert_eq!(overruled, vec!["closeSubmission"]);
+        assert!(!policy.close_submission);
+
+        // Applying twice says nothing the second time.
+        assert!(policy.apply_locks().is_empty());
+    }
+
+    /// Port 25 is inbound whatever the listener is called, and never closes
+    /// (LP-3). It is doubly safe now that SMTP is locked (LP-21), and this
+    /// test stands so LP-3 stays covered if the lock is ever lifted.
+    #[test]
+    fn port_25_is_never_closed() {
+        let policy = disabled();
+        assert!(!policy.closes("smtp", &[25]));
+        assert!(
+            !policy.closes("smtp", &[25, 465]),
+            "a listener that also binds 25 is inbound and stays"
+        );
+    }
+
+    /// JMAP, DAV and internal delivery are never touched.
+    #[test]
+    fn http_and_lmtp_are_never_closed() {
+        let policy = disabled();
+        assert!(!policy.closes("http", &[443]));
+        assert!(!policy.closes("lmtp", &[11200]));
+    }
+
+    /// Without `closeSubmission`, 465 and 587 stay open (acceptance test 2).
+    /// The lock makes this the only behaviour for now (LP-21).
+    #[test]
+    fn submission_stays_open_when_asked() {
+        let policy = ProtocolPolicy {
+            legacy_protocols: LegacyProtocols::Disabled,
+            close_submission: false,
+            ..Default::default()
+        };
+        assert!(!policy.closes("smtp", &[465]));
+        assert!(!policy.closes("smtp", &[587]));
+        assert!(
+            policy.closes("imap", &[993]),
+            "the mail-app protocols close regardless"
+        );
+    }
+
+    /// A new legacy listener is refused while the switch is on (LP-4), and an
+    /// inbound one is still allowed.
+    #[test]
+    fn new_legacy_listeners_are_refused() {
+        let policy = disabled();
+        assert!(policy.refuses_new_listener("imap", &[143]));
+        assert!(!policy.refuses_new_listener("smtp", &[25]));
+        assert!(!ProtocolPolicy::default().refuses_new_listener("imap", &[143]));
+    }
+
+    /// A saved listener keeps its whole registry object, so LP-5 can put back
+    /// fields this code never reads.
+    #[test]
+    fn saved_listeners_survive_the_round_trip() {
+        let policy = ProtocolPolicy {
+            legacy_protocols: LegacyProtocols::Disabled,
+            saved_listeners: vec![SavedListener {
+                id: "imaps".to_string(),
+                protocol: "imap".to_string(),
+                ports: vec![993],
+                object: serde_json::json!({
+                    "bind": ["[::]:993"],
+                    "tls": {"implicit": true},
+                    "somethingThisCodeHasNeverHeardOf": 7,
+                }),
+            }],
+            ..Default::default()
+        };
+        assert!(policy.check().is_ok());
+
+        let round_tripped: ProtocolPolicy =
+            serde_json::from_slice(&serde_json::to_vec(&policy).unwrap()).unwrap();
+        assert_eq!(round_tripped, policy);
+        assert_eq!(
+            round_tripped.saved_listeners[0].object["somethingThisCodeHasNeverHeardOf"],
+            7
+        );
+    }
+
+    /// A saved listener with no id is refused, naming the property.
+    #[test]
+    fn a_nameless_saved_listener_is_refused() {
+        let policy = ProtocolPolicy {
+            saved_listeners: vec![SavedListener {
+                id: String::new(),
+                protocol: "imap".to_string(),
+                ports: vec![993],
+                object: serde_json::Value::Null,
+            }],
+            ..Default::default()
+        };
+        assert_eq!(policy.check().unwrap_err().0, "savedListeners");
+    }
+}

crates/imap/src/op/authenticate.rs

@@ -2,12 +2,14 @@
  * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
  *
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ *
+ * Modified by Coffey Labs in 2026 for INBUXA.
  */
 
 use crate::core::{Session, SessionData, State};
 use common::{
     auth::AuthRequest,
-    network::{SessionStream, limiter::LimiterResult},
+    network::{SessionStream, legacy::LegacyProtocol, limiter::LimiterResult},
 };
 use directory::Credentials;
 use imap_proto::{
@@ -67,6 +69,12 @@ impl<T: SessionStream> Session<T> {
     }
 
     pub async fn authenticate(&mut self, credentials: Credentials, tag: String) -> trc::Result<()> {
+        // inbuxa: legacy-protocols LP-6, before the password is looked at
+        self.server
+            .refuse_legacy_sign_in(LegacyProtocol::Imap, &credentials)
+            .await
+            .map_err(|err| err.code(ResponseCode::Alert).id(tag.clone()))?;
+
         // Authenticate
         let access_token = self
             .server

crates/jmap-proto/src/object/inbuxa_protocol_policy.rs

@@ -0,0 +1,195 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Coffey Labs
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+//! `inbuxa:ProtocolPolicy/get` and `/set` under `urn:inbuxa:jmap`: the
+//! server-wide legacy mail protocols switch (legacy-protocols spec). A
+//! singleton, id `singleton`.
+//!
+//! Three of its properties are the server's to say, not the client's:
+//! `savedListeners` (LP-1), `lockedProtocols` (LP-21) and `wouldClose`
+//! (LP-16). A client that sets them is answered with `invalidProperties`.
+
+use crate::object::{AnyId, JmapObject, JmapObjectId};
+use jmap_tools::{Element, Key, Property};
+use std::{borrow::Cow, str::FromStr};
+use types::id::Id;
+
+#[derive(Debug, Clone, Default)]
+pub struct ProtocolPolicy;
+
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub enum ProtocolPolicyProperty {
+    Id,
+    /// The switch: `enabled` or `disabled`.
+    LegacyProtocols,
+    /// Whether submission closes with it. Forced false while SMTP is locked.
+    CloseSubmission,
+    /// Server-set: the listeners taken away, for LP-5.
+    SavedListeners,
+    ChangedAt,
+    ChangedBy,
+    /// Server-set: the protocols that cannot be closed, so the selector can
+    /// render them locked rather than carry its own list (LP-21).
+    LockedProtocols,
+    /// Server-set: exactly which listeners turning the switch would close,
+    /// by name and port, for the confirmation (LP-16).
+    WouldClose,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub enum ProtocolPolicyValue {
+    Id(Id),
+}
+
+impl Property for ProtocolPolicyProperty {
+    fn try_parse(_: Option<&Key<'_, Self>>, value: &str) -> Option<Self> {
+        ProtocolPolicyProperty::parse(value)
+    }
+
+    fn to_cow(&self) -> Cow<'static, str> {
+        match self {
+            ProtocolPolicyProperty::Id => "id",
+            ProtocolPolicyProperty::LegacyProtocols => "legacyProtocols",
+            ProtocolPolicyProperty::CloseSubmission => "closeSubmission",
+            ProtocolPolicyProperty::SavedListeners => "savedListeners",
+            ProtocolPolicyProperty::ChangedAt => "changedAt",
+            ProtocolPolicyProperty::ChangedBy => "changedBy",
+            ProtocolPolicyProperty::LockedProtocols => "lockedProtocols",
+            ProtocolPolicyProperty::WouldClose => "wouldClose",
+        }
+        .into()
+    }
+}
+
+impl ProtocolPolicyProperty {
+    fn parse(value: &str) -> Option<Self> {
+        hashify::tiny_map!(value.as_bytes(),
+            b"id" => ProtocolPolicyProperty::Id,
+            b"legacyProtocols" => ProtocolPolicyProperty::LegacyProtocols,
+            b"closeSubmission" => ProtocolPolicyProperty::CloseSubmission,
+            b"savedListeners" => ProtocolPolicyProperty::SavedListeners,
+            b"changedAt" => ProtocolPolicyProperty::ChangedAt,
+            b"changedBy" => ProtocolPolicyProperty::ChangedBy,
+            b"lockedProtocols" => ProtocolPolicyProperty::LockedProtocols,
+            b"wouldClose" => ProtocolPolicyProperty::WouldClose,
+        )
+    }
+}
+
+impl ProtocolPolicyProperty {
+    /// Whether this property is the server's to say. A client that sets one
+    /// is answered with `invalidProperties`.
+    pub fn is_server_set(&self) -> bool {
+        matches!(
+            self,
+            ProtocolPolicyProperty::SavedListeners
+                | ProtocolPolicyProperty::ChangedAt
+                | ProtocolPolicyProperty::ChangedBy
+                | ProtocolPolicyProperty::LockedProtocols
+                | ProtocolPolicyProperty::WouldClose
+        )
+    }
+}
+
+impl FromStr for ProtocolPolicyProperty {
+    type Err = ();
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        ProtocolPolicyProperty::parse(s).ok_or(())
+    }
+}
+
+impl Element for ProtocolPolicyValue {
+    type Property = ProtocolPolicyProperty;
+
+    fn try_parse<P>(key: &Key<'_, Self::Property>, value: &str) -> Option<Self> {
+        match key {
+            Key::Property(ProtocolPolicyProperty::Id) => Id::from_str(value).ok().map(ProtocolPolicyValue::Id),
+            _ => None,
+        }
+    }
+
+    fn to_cow(&self) -> Cow<'static, str> {
+        match self {
+            ProtocolPolicyValue::Id(id) => id.to_string().into(),
+        }
+    }
+}
+
+impl JmapObject for ProtocolPolicy {
+    type Property = ProtocolPolicyProperty;
+
+    type Element = ProtocolPolicyValue;
+
+    type Id = Id;
+
+    type Filter = ();
+
+    type Comparator = ();
+
+    type GetArguments = ();
+
+    type SetArguments<'de> = ();
+
+    type QueryArguments = ();
+
+    type CopyArguments = ();
+
+    type ParseArguments = ();
+
+    const ID_PROPERTY: Self::Property = ProtocolPolicyProperty::Id;
+}
+
+impl From<Id> for ProtocolPolicyValue {
+    fn from(id: Id) -> Self {
+        ProtocolPolicyValue::Id(id)
+    }
+}
+
+impl JmapObjectId for ProtocolPolicyValue {
+    fn as_id(&self) -> Option<Id> {
+        match self {
+            ProtocolPolicyValue::Id(id) => Some(*id),
+        }
+    }
+
+    fn as_any_id(&self) -> Option<AnyId> {
+        match self {
+            ProtocolPolicyValue::Id(id) => Some(AnyId::Id(*id)),
+        }
+    }
+
+    fn as_id_ref(&self) -> Option<&str> {
+        None
+    }
+
+    fn try_set_id(&mut self, new_id: AnyId) -> bool {
+        if let AnyId::Id(id) = new_id {
+            *self = ProtocolPolicyValue::Id(id);
+            true
+        } else {
+            false
+        }
+    }
+}
+
+impl JmapObjectId for ProtocolPolicyProperty {
+    fn as_id(&self) -> Option<Id> {
+        None
+    }
+
+    fn as_any_id(&self) -> Option<AnyId> {
+        None
+    }
+
+    fn as_id_ref(&self) -> Option<&str> {
+        None
+    }
+
+    fn try_set_id(&mut self, _: AnyId) -> bool {
+        false
+    }
+}

crates/jmap-proto/src/object/mod.rs

@@ -22,6 +22,7 @@ pub mod email;
 pub mod email_submission;
 pub mod fastmail_masked_email; // inbuxa: masked email
 pub mod inbuxa_ai_limits; // inbuxa: AI spam classification
+pub mod inbuxa_protocol_policy; // inbuxa: legacy protocols off
 pub mod inbuxa_deleted_account; // inbuxa: undelete
 pub mod file_node;
 pub mod identity;

crates/jmap-proto/src/references/eval.rs

@@ -61,6 +61,9 @@ impl Response<'_> {
                         GetResponseMethod::AiLimits(response) => {
                             response.eval_jptr(path, &mut results)
                         }
+                        GetResponseMethod::ProtocolPolicy(response) => {
+                            response.eval_jptr(path, &mut results)
+                        }
                         GetResponseMethod::Principal(response) => {
                             response.eval_jptr(path, &mut results)
                         }

crates/jmap-proto/src/references/resolve.rs

@@ -46,6 +46,7 @@ impl Response<'_> {
                 GetRequestMethod::MaskedEmail(request) => request.resolve_references(self)?,
                 GetRequestMethod::DeletedAccount(request) => request.resolve_references(self)?,
                 GetRequestMethod::AiLimits(request) => request.resolve_references(self)?,
+                GetRequestMethod::ProtocolPolicy(request) => request.resolve_references(self)?,
                 GetRequestMethod::Principal(request) => request.resolve_references(self)?,
                 GetRequestMethod::Quota(request) => request.resolve_references(self)?,
                 GetRequestMethod::Blob(request) => request.resolve_references(self)?,
@@ -89,6 +90,9 @@ impl Response<'_> {
                 SetRequestMethod::AiLimits(request) => {
                     request.resolve_references(self, 1, false)?
                 }
+                SetRequestMethod::ProtocolPolicy(request) => {
+                    request.resolve_references(self, 1, false)?
+                }
                 SetRequestMethod::AddressBook(request) => {
                     request.resolve_references(self, 1, false)?
                 }

crates/jmap-proto/src/request/method.rs

@@ -49,6 +49,7 @@ pub enum MethodObject {
     DeletedAccount,
     // inbuxa: AI call limits
     AiLimits,
+    ProtocolPolicy,
 }
 
 impl MethodObject {
@@ -75,6 +76,7 @@ impl MethodObject {
             MethodObject::MaskedEmail => Capability::FastmailMaskedEmail,
             MethodObject::DeletedAccount => Capability::Inbuxa,
             MethodObject::AiLimits => Capability::Inbuxa,
+            MethodObject::ProtocolPolicy => Capability::Inbuxa,
         }
     }
 }
@@ -252,6 +254,8 @@ impl MethodName {
             (MethodFunction::Set, MethodObject::DeletedAccount) => "inbuxa:DeletedAccount/set",
             (MethodFunction::Get, MethodObject::AiLimits) => "inbuxa:AiLimits/get",
             (MethodFunction::Set, MethodObject::AiLimits) => "inbuxa:AiLimits/set",
+            (MethodFunction::Get, MethodObject::ProtocolPolicy) => "inbuxa:ProtocolPolicy/get",
+            (MethodFunction::Set, MethodObject::ProtocolPolicy) => "inbuxa:ProtocolPolicy/set",
             (method, MethodObject::Registry(obj)) => {
                 return Cow::Owned(format!("x:{}/{}", obj.as_str(), method.as_str()));
             }
@@ -377,6 +381,8 @@ impl MethodName {
             "inbuxa:DeletedAccount/set" => (MethodObject::DeletedAccount, MethodFunction::Set),
             "inbuxa:AiLimits/get" => (MethodObject::AiLimits, MethodFunction::Get),
             "inbuxa:AiLimits/set" => (MethodObject::AiLimits, MethodFunction::Set),
+            "inbuxa:ProtocolPolicy/get" => (MethodObject::ProtocolPolicy, MethodFunction::Get),
+            "inbuxa:ProtocolPolicy/set" => (MethodObject::ProtocolPolicy, MethodFunction::Set),
 
         ).or_else(|| {
             let (obj, fnc) = s.strip_prefix("x:")?.split_once('/')?;
@@ -430,6 +436,7 @@ impl Display for MethodObject {
             MethodObject::MaskedEmail => "MaskedEmail",
             MethodObject::DeletedAccount => "inbuxa:DeletedAccount",
             MethodObject::AiLimits => "inbuxa:AiLimits",
+            MethodObject::ProtocolPolicy => "inbuxa:ProtocolPolicy",
             MethodObject::Registry(obj) => {
                 f.write_str("x:")?;
                 return f.write_str(obj.as_str());

crates/jmap-proto/src/request/mod.rs

@@ -116,6 +116,7 @@ pub enum GetRequestMethod {
     MaskedEmail(Box<GetRequest<crate::object::fastmail_masked_email::FastmailMaskedEmail>>),
     DeletedAccount(Box<GetRequest<crate::object::inbuxa_deleted_account::DeletedAccount>>),
     AiLimits(Box<GetRequest<crate::object::inbuxa_ai_limits::AiLimits>>),
+    ProtocolPolicy(Box<GetRequest<crate::object::inbuxa_protocol_policy::ProtocolPolicy>>),
 }
 
 #[derive(Debug)]
@@ -139,6 +140,7 @@ pub enum SetRequestMethod<'x> {
     MaskedEmail(Box<SetRequest<'x, crate::object::fastmail_masked_email::FastmailMaskedEmail>>),
     DeletedAccount(Box<SetRequest<'x, crate::object::inbuxa_deleted_account::DeletedAccount>>),
     AiLimits(Box<SetRequest<'x, crate::object::inbuxa_ai_limits::AiLimits>>),
+    ProtocolPolicy(Box<SetRequest<'x, crate::object::inbuxa_protocol_policy::ProtocolPolicy>>),
 }
 
 #[derive(Debug)]

crates/jmap-proto/src/request/parser.rs

@@ -169,6 +169,13 @@ impl<'de> Visitor<'de> for CallVisitor {
                     return Err(de::Error::invalid_length(1, &self));
                 }
             },
+            (MethodFunction::Get, MethodObject::ProtocolPolicy) => match seq.next_element() {
+                Ok(Some(value)) => RequestMethod::Get(GetRequestMethod::ProtocolPolicy(value)),
+                Err(err) => RequestMethod::invalid(err),
+                Ok(None) => {
+                    return Err(de::Error::invalid_length(1, &self));
+                }
+            },
             (MethodFunction::Get, MethodObject::VacationResponse) => match seq.next_element() {
                 Ok(Some(value)) => RequestMethod::Get(GetRequestMethod::VacationResponse(value)),
                 Err(err) => RequestMethod::invalid(err),
@@ -334,6 +341,13 @@ impl<'de> Visitor<'de> for CallVisitor {
                     return Err(de::Error::invalid_length(1, &self));
                 }
             },
+            (MethodFunction::Set, MethodObject::ProtocolPolicy) => match seq.next_element() {
+                Ok(Some(value)) => RequestMethod::Set(SetRequestMethod::ProtocolPolicy(value)),
+                Err(err) => RequestMethod::invalid(err),
+                Ok(None) => {
+                    return Err(de::Error::invalid_length(1, &self));
+                }
+            },
             (MethodFunction::Set, MethodObject::VacationResponse) => match seq.next_element() {
                 Ok(Some(value)) => RequestMethod::Set(SetRequestMethod::VacationResponse(value)),
                 Err(err) => RequestMethod::invalid(err),

crates/jmap-proto/src/response/mod.rs

@@ -103,6 +103,7 @@ pub enum GetResponseMethod {
     MaskedEmail(GetResponse<crate::object::fastmail_masked_email::FastmailMaskedEmail>),
     DeletedAccount(GetResponse<crate::object::inbuxa_deleted_account::DeletedAccount>),
     AiLimits(GetResponse<crate::object::inbuxa_ai_limits::AiLimits>),
+    ProtocolPolicy(GetResponse<crate::object::inbuxa_protocol_policy::ProtocolPolicy>),
 }
 
 #[derive(Debug, serde::Serialize)]
@@ -127,6 +128,7 @@ pub enum SetResponseMethod {
     MaskedEmail(Box<SetResponse<crate::object::fastmail_masked_email::FastmailMaskedEmail>>),
     DeletedAccount(Box<SetResponse<crate::object::inbuxa_deleted_account::DeletedAccount>>),
     AiLimits(Box<SetResponse<crate::object::inbuxa_ai_limits::AiLimits>>),
+    ProtocolPolicy(Box<SetResponse<crate::object::inbuxa_protocol_policy::ProtocolPolicy>>),
 }
 
 #[derive(Debug, serde::Serialize)]
@@ -287,6 +289,22 @@ impl<'x> From<SetResponse<crate::object::fastmail_masked_email::FastmailMaskedEm
 }
 
 // inbuxa: AI call limits
+impl<'x> From<GetResponse<crate::object::inbuxa_protocol_policy::ProtocolPolicy>>
+    for ResponseMethod<'x>
+{
+    fn from(value: GetResponse<crate::object::inbuxa_protocol_policy::ProtocolPolicy>) -> Self {
+        ResponseMethod::Get(GetResponseMethod::ProtocolPolicy(value))
+    }
+}
+
+impl<'x> From<SetResponse<crate::object::inbuxa_protocol_policy::ProtocolPolicy>>
+    for ResponseMethod<'x>
+{
+    fn from(value: SetResponse<crate::object::inbuxa_protocol_policy::ProtocolPolicy>) -> Self {
+        ResponseMethod::Set(SetResponseMethod::ProtocolPolicy(Box::new(value)))
+    }
+}
+
 impl<'x> From<GetResponse<crate::object::inbuxa_ai_limits::AiLimits>> for ResponseMethod<'x> {
     fn from(value: GetResponse<crate::object::inbuxa_ai_limits::AiLimits>) -> Self {
         ResponseMethod::Get(GetResponseMethod::AiLimits(value))

crates/jmap/src/api/auth.rs

@@ -77,6 +77,9 @@ impl JmapAuthorization for AccessToken {
                 GetRequestMethod::DeletedAccount(_) => Permission::SysAccountGet,
                 // inbuxa: AI call limits, with the classifier's permissions
                 GetRequestMethod::AiLimits(_) => Permission::SysSpamLlmGet,
+                // inbuxa: legacy protocols off. It takes listeners away and
+                // puts them back, so it takes the listener's permissions
+                GetRequestMethod::ProtocolPolicy(_) => Permission::SysNetworkListenerGet,
                 GetRequestMethod::Principal(_) => Permission::JmapPrincipalGet,
                 GetRequestMethod::Quota(_) => Permission::JmapQuotaGet,
                 GetRequestMethod::Blob(_) => Permission::JmapBlobGet,
@@ -173,6 +176,14 @@ impl JmapAuthorization for AccessToken {
                         Permission::SysSpamLlmUpdate,
                         Permission::SysSpamLlmUpdate,
                     ),
+                    // inbuxa: legacy protocols off, with the listener's
+                    SetRequestMethod::ProtocolPolicy(s) => validate_set(
+                        s,
+                        self,
+                        Permission::SysNetworkListenerUpdate,
+                        Permission::SysNetworkListenerUpdate,
+                        Permission::SysNetworkListenerUpdate,
+                    ),
                     SetRequestMethod::VacationResponse(s) => validate_set(
                         s,
                         self,
@@ -282,7 +293,8 @@ impl JmapAuthorization for AccessToken {
                 | MethodObject::SieveScript
                 | MethodObject::MaskedEmail
                 | MethodObject::DeletedAccount
-                | MethodObject::AiLimits => Permission::JmapEmailChanges,
+                | MethodObject::AiLimits
+                | MethodObject::ProtocolPolicy => Permission::JmapEmailChanges,
                 // inbuxa: x:MaskedEmail/changes reads what /get reads
                 MethodObject::Registry(object_type) => object_type.get_permission(),
             },

crates/jmap/src/api/request.rs

@@ -221,6 +221,9 @@ impl RequestHandler for Server {
                                     SetResponseMethod::AiLimits(set_response) => {
                                         set_response.update_created_ids(&mut response);
                                     }
+                                    SetResponseMethod::ProtocolPolicy(set_response) => {
+                                        set_response.update_created_ids(&mut response);
+                                    }
                                     SetResponseMethod::AddressBook(set_response) => {
                                         set_response.update_created_ids(&mut response);
                                     }
@@ -376,6 +379,13 @@ impl RequestHandler for Server {
                         .await?
                         .into()
                 }
+                // inbuxa: inbuxa:ProtocolPolicy/get (legacy protocols off)
+                GetRequestMethod::ProtocolPolicy(mut req) => {
+                    resolve_account_id(&mut req.account_id, method_name.obj, access_token)?;
+                    crate::inbuxa::protocol_policy::get(self, access_token, *req)
+                        .await?
+                        .into()
+                }
                 GetRequestMethod::Principal(req) => {
                     self.principal_get(*req, access_token).await?.into()
                 }
@@ -617,6 +627,13 @@ impl RequestHandler for Server {
                         .await?
                         .into()
                 }
+                // inbuxa: inbuxa:ProtocolPolicy/set (legacy protocols off)
+                SetRequestMethod::ProtocolPolicy(mut req) => {
+                    resolve_account_id(&mut req.account_id, method_name.obj, access_token)?;
+                    crate::inbuxa::protocol_policy::set(self, access_token, *req)
+                        .await?
+                        .into()
+                }
                 SetRequestMethod::AddressBook(mut req) => {
                     resolve_account_id(&mut req.account_id, method_name.obj, access_token)?;
                     access_token.assert_has_access(req.account_id, Collection::AddressBook)?;

crates/jmap/src/changes/get.rs

@@ -418,6 +418,7 @@ impl IntermediateChangesResponse {
             | MethodObject::MaskedEmail
             | MethodObject::DeletedAccount
             | MethodObject::AiLimits
+            | MethodObject::ProtocolPolicy
             | MethodObject::Registry(_) => unreachable!(),
         })
     }

crates/jmap/src/inbuxa/mod.rs

@@ -9,6 +9,7 @@
 
 pub mod access;
 pub mod ai_limits;
+pub mod protocol_policy;
 pub mod deleted_account;
 pub mod fastmail;
 pub mod masked_email;

crates/jmap/src/inbuxa/protocol_policy.rs

@@ -0,0 +1,432 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Coffey Labs
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+//! `inbuxa:ProtocolPolicy/get` and `/set`: the server-wide legacy mail
+//! protocols switch (legacy-protocols spec). Server-level: a principal in a
+//! tenant can neither read nor change it, and turns its own switch instead
+//! (LP-9).
+//!
+//! `/set` does not write the policy itself. It hands what was asked to
+//! [`Server::set_protocol_policy`], which applies the locks (LP-21), removes
+//! or restores the listener objects (LP-1, LP-5) and closes or opens their
+//! sockets (LP-2). What comes back is what actually happened.
+//!
+//! [`validate_listener`] is the registry's side of it: while the switch is
+//! off, no listener it would close may be created, or made by an update
+//! (LP-4).
+
+use crate::registry::mapping::{ObjectResponse, RegistrySetResponse, ValidationResult};
+use common::{Server, auth::AccessToken, network::legacy::PolicyChange};
+use inbuxa_features::security::{
+    listeners,
+    protocol_policy::{LOCKED_PROTOCOLS, LegacyProtocols, ProtocolPolicy as Policy, SavedListener},
+};
+use jmap_proto::{
+    error::set::SetError,
+    method::{
+        get::{GetRequest, GetResponse},
+        set::{SetRequest, SetResponse},
+    },
+    object::inbuxa_protocol_policy::{
+        ProtocolPolicy, ProtocolPolicyProperty as P, ProtocolPolicyValue,
+    },
+    request::IntoValid,
+};
+use jmap_tools::{Key, Map, Value};
+use registry::schema::{prelude::Property, structs::NetworkListener};
+use types::id::Id;
+
+type PValue = Value<'static, P, ProtocolPolicyValue>;
+
+const ALL: &[P] = &[
+    P::Id,
+    P::LegacyProtocols,
+    P::CloseSubmission,
+    P::SavedListeners,
+    P::ChangedAt,
+    P::ChangedBy,
+    P::LockedProtocols,
+    P::WouldClose,
+];
+
+fn assert_server_level(access_token: &AccessToken) -> trc::Result<()> {
+    if access_token.tenant_id().is_some() {
+        Err(trc::JmapEvent::Forbidden
+            .into_err()
+            .details("The server-wide protocol policy is server-level."))
+    } else {
+        Ok(())
+    }
+}
+
+/// A saved or would-be-closed listener, as the confirmation shows it (LP-16).
+fn listener_value(listener: &SavedListener) -> PValue {
+    let mut out = Map::with_capacity(3);
+    out.insert_unchecked(
+        Key::Property(P::Id),
+        Value::Str(listener.id.clone().into()),
+    );
+    out.insert_unchecked(
+        Key::Property(P::LegacyProtocols),
+        Value::Str(listener.protocol.clone().into()),
+    );
+    out.insert_unchecked(
+        Key::Property(P::WouldClose),
+        Value::Array(
+            listener
+                .ports
+                .iter()
+                .map(|port| Value::Number((*port as u64).into()))
+                .collect(),
+        ),
+    );
+    Value::Object(out)
+}
+
+fn to_value(policy: &Policy, would_close: &[SavedListener], properties: &[P]) -> PValue {
+    let mut out = Map::with_capacity(properties.len());
+    for property in properties {
+        let value = match property {
+            P::Id => Value::Element(ProtocolPolicyValue::Id(Id::singleton())),
+            P::LegacyProtocols => Value::Str(
+                match policy.legacy_protocols {
+                    LegacyProtocols::Enabled => "enabled",
+                    LegacyProtocols::Disabled => "disabled",
+                }
+                .into(),
+            ),
+            P::CloseSubmission => Value::Bool(policy.close_submission),
+            P::SavedListeners => Value::Array(
+                policy
+                    .saved_listeners
+                    .iter()
+                    .map(listener_value)
+                    .collect(),
+            ),
+            P::ChangedAt => policy
+                .changed_at
+                .map(|at| Value::Number(at.into()))
+                .unwrap_or(Value::Null),
+            P::ChangedBy => policy
+                .changed_by
+                .as_ref()
+                .map(|by| Value::Str(by.clone().into()))
+                .unwrap_or(Value::Null),
+            // The selector renders these locked rather than carrying its own
+            // list, so unlocking later needs no admin release (LP-21).
+            P::LockedProtocols => Value::Array(
+                LOCKED_PROTOCOLS
+                    .iter()
+                    .map(|protocol| Value::Str((*protocol).into()))
+                    .collect(),
+            ),
+            // Exactly what turning the switch on would close, by name and
+            // port, so the confirmation can say so before anything happens
+            // (LP-16).
+            P::WouldClose => Value::Array(would_close.iter().map(listener_value).collect()),
+        };
+        out.insert_unchecked(Key::Property(property.clone()), value);
+    }
+    Value::Object(out)
+}
+
+/// The listeners turning the switch on would close, whatever it is now.
+async fn would_close(server: &Server, policy: &Policy) -> trc::Result<Vec<SavedListener>> {
+    let mut hypothetical = policy.clone();
+    hypothetical.legacy_protocols = LegacyProtocols::Disabled;
+    hypothetical.apply_locks();
+    listeners::would_close(server.registry(), &hypothetical).await
+}
+
+/// `inbuxa:ProtocolPolicy/get`.
+pub async fn get(
+    server: &Server,
+    access_token: &AccessToken,
+    mut request: GetRequest<ProtocolPolicy>,
+) -> trc::Result<GetResponse<ProtocolPolicy>> {
+    assert_server_level(access_token)?;
+    let properties = request.unwrap_properties(ALL);
+    let (ids, not_found) = request.unwrap_ids(1)?;
+    let mut response = GetResponse {
+        account_id: request.account_id.into(),
+        state: None,
+        list: Vec::new(),
+        not_found,
+    };
+
+    let policy = server.protocol_policy().await?;
+    // Only worth asking the registry when the answer is wanted.
+    let would_close = if properties.contains(&P::WouldClose) {
+        would_close(server, &policy).await?
+    } else {
+        Vec::new()
+    };
+
+    match ids {
+        None => response
+            .list
+            .push(to_value(&policy, &would_close, &properties)),
+        Some(ids) => {
+            for id in ids {
+                if id.is_singleton() {
+                    response
+                        .list
+                        .push(to_value(&policy, &would_close, &properties));
+                } else {
+                    response.push_not_found(id);
+                }
+            }
+        }
+    }
+    Ok(response)
+}
+
+fn apply(
+    policy: &mut Policy,
+    property: &P,
+    value: &Value<'_, P, ProtocolPolicyValue>,
+) -> Result<(), String> {
+    match property {
+        P::LegacyProtocols => {
+            policy.legacy_protocols = match value.as_str().as_deref() {
+                Some("enabled") => LegacyProtocols::Enabled,
+                Some("disabled") => LegacyProtocols::Disabled,
+                _ => return Err(r#"must be "enabled" or "disabled""#.to_string()),
+            }
+        }
+        P::CloseSubmission => {
+            policy.close_submission = value
+                .as_bool()
+                .ok_or_else(|| "must be true or false".to_string())?
+        }
+        P::Id => return Err("is immutable".to_string()),
+        // savedListeners, changedAt, changedBy, lockedProtocols and wouldClose
+        // are the server's to say (LP-1, LP-16, LP-21).
+        other if other.is_server_set() => return Err("is set by the server".to_string()),
+        _ => return Err("is immutable".to_string()),
+    }
+    Ok(())
+}
+
+/// Puts a property back to its default (a `null` in `/set`).
+fn reset(policy: &mut Policy, property: &P, defaults: &Policy) -> Result<(), String> {
+    match property {
+        P::LegacyProtocols => policy.legacy_protocols = defaults.legacy_protocols,
+        P::CloseSubmission => policy.close_submission = defaults.close_submission,
+        P::Id => return Err("is immutable".to_string()),
+        other if other.is_server_set() => return Err("is set by the server".to_string()),
+        _ => return Err("is immutable".to_string()),
+    }
+    Ok(())
+}
+
+/// What the server made of the update, when that differs from what was asked.
+///
+/// A locked property is overruled rather than refused (LP-21), so the client
+/// is told by being handed the value that was actually stored. `None` when
+/// nothing was overruled, which JMAP reads as "exactly as you asked".
+fn updated_value(change: &PolicyChange) -> Option<PValue> {
+    if change.overruled.is_empty() {
+        return None;
+    }
+    let mut out = Map::with_capacity(change.overruled.len());
+    for property in &change.overruled {
+        if *property == "closeSubmission" {
+            out.insert_unchecked(Key::Property(P::CloseSubmission), Value::Bool(false));
+        }
+    }
+    Some(Value::Object(out))
+}
+
+/// `inbuxa:ProtocolPolicy/set`: turns the switch. Unset (`null`) restores a
+/// property's default.
+pub async fn set(
+    server: &Server,
+    access_token: &AccessToken,
+    mut request: SetRequest<'_, ProtocolPolicy>,
+) -> trc::Result<SetResponse<ProtocolPolicy>> {
+    assert_server_level(access_token)?;
+    let mut response = SetResponse::from_request(&request, server.core.jmap.set_max_objects)?;
+    for (client_id, _) in request.unwrap_create() {
+        response.not_created.append(client_id, SetError::singleton());
+    }
+    for id in request.unwrap_destroy().into_valid() {
+        response.not_destroyed.append(id, SetError::singleton());
+    }
+
+    for (id, value) in request.unwrap_update().into_valid() {
+        if !id.is_singleton() {
+            response.not_updated.append(id, SetError::not_found());
+            continue;
+        }
+
+        let mut policy = server.protocol_policy().await?;
+        let defaults = Policy::default();
+        let mut error = None;
+
+        for (key, value) in value.into_expanded_object() {
+            let Key::Property(property) = &key else {
+                error = Some(SetError::invalid_properties().with_property(key.into_owned()));
+                break;
+            };
+            let result = if matches!(value, Value::Null) {
+                reset(&mut policy, property, &defaults)
+            } else {
+                apply(&mut policy, property, &value)
+            };
+            if let Err(why) = result {
+                error = Some(
+                    SetError::invalid_properties()
+                        .with_property(property.clone())
+                        .with_description(why),
+                );
+                break;
+            }
+        }
+
+        if error.is_none()
+            && let Err((property, why)) = policy.check()
+        {
+            error = Some(
+                SetError::invalid_properties()
+                    .with_property(property.parse::<P>().unwrap_or(P::Id))
+                    .with_description(format!("{property} {why}.")),
+            );
+        }
+
+        match error {
+            Some(error) => response.not_updated.append(id, error),
+            None => {
+                let change = server
+                    .set_protocol_policy(policy, Some(Id::from(access_token.account_id()).to_string()))
+                    .await?;
+
+                // An overruled property is reported, not refused: the value
+                // is specified and the lock is temporary (LP-21). The update
+                // succeeded, so the client is told by being handed what was
+                // actually stored.
+                response.updated.append(id, updated_value(&change));
+            }
+        }
+    }
+    Ok(response)
+}
+
+/// LP-4: while legacy protocols are off, a listener the switch would close
+/// may not be created, nor may an update make one. Otherwise a listener could
+/// quietly reopen a port the switch is meant to keep closed.
+///
+/// The rule is the switch's own ([`listeners::closes`]), so a locked protocol
+/// or the inbound port is never refused here, and what the switch would close
+/// is exactly what can't be added. Putting saved listeners back (LP-5) goes
+/// through the registry directly, not through `/set`, so it isn't affected.
+pub(crate) async fn validate_listener(
+    set: &RegistrySetResponse<'_>,
+    listener: &NetworkListener,
+) -> ValidationResult {
+    let policy = set.server.protocol_policy().await?;
+    Ok(match listener_refusal(&policy, listener) {
+        Some((property, why)) => Err(SetError::invalid_properties()
+            .with_property(property)
+            .with_description(why)),
+        None => Ok(ObjectResponse::default()),
+    })
+}
+
+/// Why this listener can't exist under this policy, naming the policy and the
+/// property to change, or `None` when it can.
+fn listener_refusal(policy: &Policy, listener: &NetworkListener) -> Option<(Property, String)> {
+    if !listeners::closes(policy, listener) {
+        return None;
+    }
+    let protocol = listeners::protocol_name(listener.protocol);
+    // A submission listener closes because of its port, not its protocol
+    // (LP-3), so the port is what would have to change.
+    let property = if protocol == "smtp" {
+        Property::Bind
+    } else {
+        Property::Protocol
+    };
+    Some((
+        property,
+        format!(
+            "Legacy mail protocols are off (inbuxa:ProtocolPolicy), and this {protocol} \
+             listener would reopen a port the switch keeps closed. Turn legacy protocols \
+             back on first."
+        ),
+    ))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use registry::{
+        schema::{enums::NetworkListenerProtocol, prelude::SocketAddr},
+        types::map::Map,
+    };
+    use std::str::FromStr;
+
+    fn listener(protocol: NetworkListenerProtocol, bind: &str) -> NetworkListener {
+        NetworkListener {
+            name: "new".to_string(),
+            protocol,
+            bind: Map::new(vec![SocketAddr::from_str(bind).unwrap()]),
+            ..Default::default()
+        }
+    }
+
+    fn off() -> Policy {
+        let mut policy = Policy {
+            legacy_protocols: LegacyProtocols::Disabled,
+            ..Default::default()
+        };
+        policy.apply_locks();
+        policy
+    }
+
+    #[test]
+    fn on_refuses_nothing() {
+        let on = Policy::default();
+        for protocol in [
+            NetworkListenerProtocol::Imap,
+            NetworkListenerProtocol::Pop3,
+            NetworkListenerProtocol::ManageSieve,
+        ] {
+            assert!(listener_refusal(&on, &listener(protocol, "[::]:1993")).is_none());
+        }
+    }
+
+    #[test]
+    fn off_refuses_every_legacy_protocol_naming_the_policy() {
+        for protocol in [
+            NetworkListenerProtocol::Imap,
+            NetworkListenerProtocol::Pop3,
+            NetworkListenerProtocol::ManageSieve,
+        ] {
+            let (property, why) =
+                listener_refusal(&off(), &listener(protocol, "[::]:1993")).expect("refused");
+            assert_eq!(property, Property::Protocol);
+            assert!(why.contains("inbuxa:ProtocolPolicy"), "{why}");
+        }
+    }
+
+    #[test]
+    fn off_still_allows_what_the_switch_never_closes() {
+        // Locked (LP-21) and inbound (LP-3): the switch doesn't close them,
+        // so there is nothing for a new one to reopen.
+        for (protocol, bind) in [
+            (NetworkListenerProtocol::Smtp, "[::]:25"),
+            (NetworkListenerProtocol::Smtp, "[::]:587"),
+            (NetworkListenerProtocol::Http, "[::]:443"),
+            (NetworkListenerProtocol::Lmtp, "[::]:24"),
+        ] {
+            assert!(
+                listener_refusal(&off(), &listener(protocol, bind)).is_none(),
+                "{protocol:?} on {bind}"
+            );
+        }
+    }
+}

crates/jmap/src/registry/set.rs

@@ -502,6 +502,11 @@ impl RegistrySet for Server {
                             )
                             .await?
                         }
+                        // inbuxa: legacy-protocols LP-4
+                        ObjectInner::NetworkListener(listener) => {
+                            crate::inbuxa::protocol_policy::validate_listener(&set, listener)
+                                .await?
+                        }
                         // inbuxa: ME-12 to ME-17
                         ObjectInner::MaskedEmail(mask) => {
                             let old = match &modification {

crates/main/src/main.rs

@@ -9,14 +9,21 @@
 #![warn(clippy::cast_possible_wrap)]
 #![warn(clippy::cast_sign_loss)]
 
-use common::{BuildServer, config::server::ServerProtocol, manager::boot::BootManager};
+use common::{
+    BuildServer, Inner,
+    config::server::{Listener, ServerProtocol},
+    manager::boot::BootManager,
+    network::TcpAcceptor,
+};
 use http::HttpSessionManager;
 use imap::core::ImapSessionManager;
 use managesieve::core::ManageSieveSessionManager;
 use pop3::Pop3SessionManager;
 use services::{StartServices, broadcast::subscriber::spawn_broadcast_subscriber};
 use smtp::{StartQueueManager, core::SmtpSessionManager};
+use std::sync::Arc;
 use std::time::Duration;
+use tokio::sync::watch;
 use trc::Collector;
 use utils::wait_for_shutdown;
 
@@ -70,42 +77,31 @@ async fn main() -> std::io::Result<()> {
     }
 
     // Spawn servers
-    let (shutdown_tx, shutdown_rx) = init.servers.spawn(|server, acceptor, shutdown_rx| {
+    // Each listener gets its own shutdown channel, registered under its id, so
-        match &server.protocol {
+    // the legacy-protocols switch can close one protocol's ports and leave the
-            ServerProtocol::Smtp | ServerProtocol::Lmtp => server.spawn(
+    // rest accepting (legacy-protocols LP-2). The registry lives in `Data` and
-                SmtpSessionManager::new(init.inner.clone()),
+    // so outlives the listeners, which it must: it owns the sending ends.
-                init.inner.clone(),
+    let listener_control = &init.inner.data.listener_control;
-                acceptor,
+    let spawn_inner = init.inner.clone();
-                shutdown_rx,
+    let (shutdown_tx, shutdown_rx) =
-            ),
+        init.servers
-            ServerProtocol::Http => server.spawn(
+            .spawn_with_control(listener_control, |server, acceptor, shutdown_rx| {
-                HttpSessionManager::new(init.inner.clone()),
+                spawn_listener(&spawn_inner, server, acceptor, shutdown_rx);
-                init.inner.clone(),
+            });
-                acceptor,
+
-                shutdown_rx,
+    // Leave behind how to spawn a listener, so putting one back opens its port
-            ),
+    // without a restart (LP-5). Only this file knows the session manager for a
-            ServerProtocol::Imap => server.spawn(
+    // protocol, so only this file can say.
-                ImapSessionManager::new(init.inner.clone()),
+    let spawn_inner = init.inner.clone();
-                init.inner.clone(),
+    init.inner
-                acceptor,
+        .data
-                shutdown_rx,
+        .listener_control
-            ),
+        .set_spawner(Box::new(move |server, acceptor, shutdown_rx| {
-            ServerProtocol::Pop3 => server.spawn(
+            spawn_listener(&spawn_inner, server, acceptor, shutdown_rx);
-                Pop3SessionManager::new(init.inner.clone()),
+        }));
-                init.inner.clone(),
-                acceptor,
-                shutdown_rx,
-            ),
-            ServerProtocol::ManageSieve => server.spawn(
-                ManageSieveSessionManager::new(init.inner.clone()),
-                init.inner.clone(),
-                acceptor,
-                shutdown_rx,
-            ),
-        };
-    });
 
     // Start broadcast subscriber
+    let inner = init.inner.clone();
     spawn_broadcast_subscriber(init.inner, shutdown_rx);
 
     // Wait for shutdown signal
@@ -114,11 +110,57 @@ async fn main() -> std::io::Result<()> {
     // Shutdown collector
     Collector::shutdown();
 
-    // Stop services
+    // Stop services, then the listeners: the shutdown sender no longer reaches
+    // them, since each holds its own channel (LP-2).
     let _ = shutdown_tx.send(true);
+    inner.data.listener_control.stop_all();
 
     // Wait for services to finish
     tokio::time::sleep(Duration::from_secs(1)).await;
 
     Ok(())
 }
+
+/// Starts one listener under the session manager its protocol calls for.
+///
+/// Used twice: once for every listener at startup, and again whenever the
+/// legacy-protocols switch puts a listener back (LP-5).
+fn spawn_listener(
+    inner: &Arc<Inner>,
+    server: Listener,
+    acceptor: TcpAcceptor,
+    shutdown_rx: watch::Receiver<bool>,
+) {
+    match &server.protocol {
+        ServerProtocol::Smtp | ServerProtocol::Lmtp => server.spawn(
+            SmtpSessionManager::new(inner.clone()),
+            inner.clone(),
+            acceptor,
+            shutdown_rx,
+        ),
+        ServerProtocol::Http => server.spawn(
+            HttpSessionManager::new(inner.clone()),
+            inner.clone(),
+            acceptor,
+            shutdown_rx,
+        ),
+        ServerProtocol::Imap => server.spawn(
+            ImapSessionManager::new(inner.clone()),
+            inner.clone(),
+            acceptor,
+            shutdown_rx,
+        ),
+        ServerProtocol::Pop3 => server.spawn(
+            Pop3SessionManager::new(inner.clone()),
+            inner.clone(),
+            acceptor,
+            shutdown_rx,
+        ),
+        ServerProtocol::ManageSieve => server.spawn(
+            ManageSieveSessionManager::new(inner.clone()),
+            inner.clone(),
+            acceptor,
+            shutdown_rx,
+        ),
+    }
+}

crates/managesieve/src/op/authenticate.rs

@@ -2,12 +2,14 @@
  * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
  *
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ *
+ * Modified by Coffey Labs in 2026 for INBUXA.
  */
 
 use crate::core::{Command, Session, State, StatusResponse};
 use common::{
     auth::AuthRequest,
-    network::{SessionStream, limiter::LimiterResult},
+    network::{SessionStream, legacy::LegacyProtocol, limiter::LimiterResult},
 };
 use directory::Credentials;
 use imap_proto::{
@@ -65,6 +67,11 @@ impl<T: SessionStream> Session<T> {
             }
         };
 
+        // inbuxa: legacy-protocols LP-6, before the password is looked at
+        self.server
+            .refuse_legacy_sign_in(LegacyProtocol::ManageSieve, &credentials)
+            .await?;
+
         // Authenticate
         let access_token = self
             .server

crates/pop3/src/op/authenticate.rs

@@ -2,6 +2,8 @@
  * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
  *
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ *
+ * Modified by Coffey Labs in 2026 for INBUXA.
  */
 
 use crate::{
@@ -10,7 +12,7 @@ use crate::{
 };
 use common::{
     auth::AuthRequest,
-    network::{SessionStream, limiter::LimiterResult},
+    network::{SessionStream, legacy::LegacyProtocol, limiter::LimiterResult},
 };
 use directory::Credentials;
 use mail_parser::decoders::base64::base64_decode;
@@ -61,6 +63,11 @@ impl<T: SessionStream> Session<T> {
     }
 
     pub async fn handle_auth(&mut self, credentials: Credentials) -> trc::Result<()> {
+        // inbuxa: legacy-protocols LP-6, before the password is looked at
+        self.server
+            .refuse_legacy_sign_in(LegacyProtocol::Pop3, &credentials)
+            .await?;
+
         // Authenticate
         let access_token = self
             .server

crates/smtp/src/inbound/auth.rs

@@ -2,10 +2,15 @@
  * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
  *
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ *
+ * Modified by Coffey Labs in 2026 for INBUXA.
  */
 
 use crate::core::Session;
-use common::{auth::AuthRequest, network::SessionStream};
+use common::{
+    auth::AuthRequest,
+    network::{SessionStream, legacy::LegacyProtocol},
+};
 use directory::Credentials;
 use mail_parser::decoders::base64::base64_decode;
 use registry::schema::enums::Permission;
@@ -108,6 +113,26 @@ impl<T: SessionStream> Session<T> {
     }
 
     pub async fn authenticate(&mut self, credentials: Credentials) -> Result<bool, ()> {
+        // inbuxa: legacy-protocols LP-6. Refused before the password is looked
+        // at, and not counted as an authentication error (LP-11). Only mail
+        // apps authenticate, so this never touches inbound delivery (LP-3).
+        if let Err(err) = self
+            .server
+            .refuse_legacy_sign_in(LegacyProtocol::Submission, &credentials)
+            .await
+        {
+            let refused = err.matches(trc::EventType::Auth(AuthEvent::LegacyProtocolRefused));
+            trc::error!(err.span_id(self.data.session_id));
+            if refused {
+                self.write(LegacyProtocol::Submission.refusal().as_bytes())
+                    .await?;
+            } else {
+                self.write(b"454 4.7.0 Temporary authentication failure\r\n")
+                    .await?;
+            }
+            return Ok(false);
+        }
+
         // Authenticate
         let result = self
             .server

crates/spam-filter/Cargo.toml

@@ -19,7 +19,7 @@ tokio = { version = "1.53", features = ["net", "macros"] }
 psl = "2"
 hyper = { version = "1.11.1", features = ["server", "http1", "http2"] }
 idna = "1.1"
-decancer = "3.3.3"
+decancer = "4.0.0"
 unicode-security = "0.1.2"
 infer = "0.22"
 hashify = "0.2"

crates/spam-filter/src/modules/classifier.rs

@@ -1136,7 +1136,7 @@ impl<'x> Tokens<'x> {
                 {
                     if word.len() > MAX_TOKEN_LENGTH {
                         self.insert(Token::Word {
-                            value: truncate_word(cured_word.as_str(), MAX_TOKEN_LENGTH)
+                            value: truncate_word(&cured_word, MAX_TOKEN_LENGTH)
                                 .to_string()
                                 .into(),
                         });
@@ -1282,7 +1282,6 @@ impl Token<'static> {
         } else if !is_ascii {
             let word: String = if let Ok(cured) = decancer::cure(s, decancer::Options::default()) {
                 cured
-                    .as_str()
                     .chars()
                     .filter(|ch| ch.is_alphabetic())
                     .take(MAX_TOKEN_LENGTH)

crates/store/Cargo.toml

@@ -9,7 +9,7 @@ types = { path = "../types" }
 nlp = { path = "../nlp" }
 trc = { path = "../trc" }
 registry = { path = "../registry" }
-rocksdb = { version = "0.24", optional = true, features = ["multi-threaded-cf"] }
+rocksdb = { version = "0.25", optional = true, features = ["multi-threaded-cf"] }
 foundationdb = { version = "0.11", features = ["embedded-fdb-include", "fdb-7_4"], optional = true }
 rusqlite = { version = "0.40", features = ["bundled"], optional = true }
 rust-s3 = { version = "0.37", default-features = false, features = ["tokio-rustls-tls"], optional = true }

crates/trc/src/event/enums.rs

@@ -8,8 +8,9 @@
 
 // This file is auto-generated. Do not edit directly.
 
-// inbuxa: 637 to 641 are the fork's SCIM events (SCIM-54)
+// inbuxa: 637 to 641 are the fork's SCIM events (SCIM-54); 642 is
-pub const TOTAL_EVENT_COUNT: usize = 642;
+// auth.legacy-protocol-refused (legacy-protocols LP-6)
+pub const TOTAL_EVENT_COUNT: usize = 643;
 pub const TOTAL_METRIC_COUNT: usize = 369;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
@@ -116,6 +117,8 @@ pub enum AuthEvent {
     Error = 34,
     Warning = 595,
     CredentialExpired = 276,
+    // inbuxa: legacy-protocols LP-6
+    LegacyProtocolRefused = 642,
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]

crates/trc/src/event/enums_impl.rs

@@ -56,6 +56,8 @@ impl EventType {
             b"auth.mfa-required" => EventType::Auth(AuthEvent::MfaRequired),
             b"auth.too-many-attempts" => EventType::Auth(AuthEvent::TooManyAttempts),
             b"auth.client-registration" => EventType::Auth(AuthEvent::ClientRegistration),
+            // inbuxa: legacy-protocols LP-6
+            b"auth.legacy-protocol-refused" => EventType::Auth(AuthEvent::LegacyProtocolRefused),
             b"auth.error" => EventType::Auth(AuthEvent::Error),
             b"auth.warning" => EventType::Auth(AuthEvent::Warning),
             b"auth.credential-expired" => EventType::Auth(AuthEvent::CredentialExpired),
@@ -705,6 +707,8 @@ impl EventType {
             EventType::Auth(AuthEvent::MfaRequired) => "auth.mfa-required",
             EventType::Auth(AuthEvent::TooManyAttempts) => "auth.too-many-attempts",
             EventType::Auth(AuthEvent::ClientRegistration) => "auth.client-registration",
+            // inbuxa: legacy-protocols LP-6
+            EventType::Auth(AuthEvent::LegacyProtocolRefused) => "auth.legacy-protocol-refused",
             EventType::Auth(AuthEvent::Error) => "auth.error",
             EventType::Auth(AuthEvent::Warning) => "auth.warning",
             EventType::Auth(AuthEvent::CredentialExpired) => "auth.credential-expired",
@@ -1489,6 +1493,8 @@ impl EventType {
             EventType::Auth(AuthEvent::MfaRequired) => 36,
             EventType::Auth(AuthEvent::TooManyAttempts) => 38,
             EventType::Auth(AuthEvent::ClientRegistration) => 555,
+            // inbuxa: legacy-protocols LP-6
+            EventType::Auth(AuthEvent::LegacyProtocolRefused) => 642,
             EventType::Auth(AuthEvent::Error) => 34,
             EventType::Auth(AuthEvent::Warning) => 595,
             EventType::Auth(AuthEvent::CredentialExpired) => 276,
@@ -2137,6 +2143,8 @@ impl EventType {
             36 => Some(EventType::Auth(AuthEvent::MfaRequired)),
             38 => Some(EventType::Auth(AuthEvent::TooManyAttempts)),
             555 => Some(EventType::Auth(AuthEvent::ClientRegistration)),
+            // inbuxa: legacy-protocols LP-6
+            642 => Some(EventType::Auth(AuthEvent::LegacyProtocolRefused)),
             34 => Some(EventType::Auth(AuthEvent::Error)),
             595 => Some(EventType::Auth(AuthEvent::Warning)),
             276 => Some(EventType::Auth(AuthEvent::CredentialExpired)),
@@ -2848,6 +2856,8 @@ impl EventType {
             EventType::Acme(AcmeEvent::TlsAlpnReceived) => Level::Info,
             EventType::Auth(AuthEvent::Success) => Level::Info,
             EventType::Auth(AuthEvent::ClientRegistration) => Level::Info,
+            // inbuxa: legacy-protocols LP-6
+            EventType::Auth(AuthEvent::LegacyProtocolRefused) => Level::Info,
             EventType::Calendar(CalendarEvent::AlarmSent) => Level::Info,
             EventType::Calendar(CalendarEvent::ItipMessageSent) => Level::Info,
             EventType::Calendar(CalendarEvent::ItipMessageReceived) => Level::Info,
@@ -3187,6 +3197,8 @@ impl EventType {
             EventType::Auth(AuthEvent::MfaRequired) => "Missing MFA token for authentication",
             EventType::Auth(AuthEvent::TooManyAttempts) => "Too many authentication attempts",
             EventType::Auth(AuthEvent::ClientRegistration) => "OAuth Client registration",
+            // inbuxa: legacy-protocols LP-6
+            EventType::Auth(AuthEvent::LegacyProtocolRefused) => "Legacy mail protocol sign-in refused",
             EventType::Auth(AuthEvent::Error) => "Authentication error",
             EventType::Auth(AuthEvent::Warning) => "Authentication warning",
             EventType::Auth(AuthEvent::CredentialExpired) => "Credential expired",
@@ -3951,6 +3963,8 @@ impl EventType {
             }
             EventType::Auth(AuthEvent::TooManyAttempts) => "Too many authentication attempts",
             EventType::Auth(AuthEvent::ClientRegistration) => "Authentication error",
+            // inbuxa: legacy-protocols LP-6
+            EventType::Auth(AuthEvent::LegacyProtocolRefused) => "This server allows only INBUXA webmail and JMAP apps",
             EventType::Auth(AuthEvent::Error) => "Authentication error",
             EventType::Auth(AuthEvent::CredentialExpired) => "Credential expired",
             EventType::Imap(ImapEvent::ConnectionStart) => "IMAP error",
@@ -4259,6 +4273,8 @@ impl EventType {
             EventType::Auth(AuthEvent::MfaRequired),
             EventType::Auth(AuthEvent::TooManyAttempts),
             EventType::Auth(AuthEvent::ClientRegistration),
+            // inbuxa: legacy-protocols LP-6
+            EventType::Auth(AuthEvent::LegacyProtocolRefused),
             EventType::Auth(AuthEvent::Error),
             EventType::Auth(AuthEvent::Warning),
             EventType::Auth(AuthEvent::CredentialExpired),

resources/schema/schema.json.sha256

@@ -1 +1 @@
--DHPbeChvvEHbLbAO3wDU6KCP8HrzaWZHfkka30YoIU
+C32Zc43ANGr52j0cZkTq3IEPrGtbFUX0d2-R91noCho

tests/e2e/legacy_protocols.py

@@ -0,0 +1,429 @@
+#!/usr/bin/env python3
+"""Local end-to-end check of the legacy-protocols switch.
+
+Run it with `python3 tests/e2e/legacy_protocols.py` after
+`cargo build -p inbuxa`. Needs Docker. Working state goes under target/e2e.
+
+Boots the debug binary, turns the switch off, and checks that the IMAP and
+POP3 ports really stop accepting while SMTP, submission and JMAP keep going.
+Then turns it back on and checks the ports come back.
+
+This is the part unit tests cannot reach: whether a socket actually closes on
+a running server (LP-2), and whether a listener put back actually binds again
+(LP-5). Acceptance tests 15, 17 and 18.
+
+It also checks the second lock (LP-6): while the switch is off, sign-in over
+submission -- locked open -- is refused with the spec's words, with the right
+password and with a wrong one, and refusals never add up to a disconnect
+(LP-11). And that a normal IMAP sign-in works with the switch on, before and
+after. And that while it is off, no listener the switch would close can be
+created, or made by an update (LP-4, test 4), and nothing advertises what is
+closed: autoconfig, autodiscover and PACC offer no IMAP, POP3 or submission,
+and the suggested zone marks their SRV names not offered (LP-7, test 5).
+
+Passwords are generated into files under target/e2e and never printed.
+Everything is removed afterwards unless KEEP=1.
+"""
+import base64, json, os, secrets, shutil, socket, ssl, subprocess, sys, time, urllib.request, urllib.error
+
+ROOT = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+DIR = f"{ROOT}/target/e2e"
+NAME = "inbuxa-legacy"
+HTTP = "http://127.0.0.1:18080"
+# port -> how to tell a live server from Docker's proxy. Publishing a port
+# makes the host side accept connections whether or not anything is listening
+# inside the container, so a bare connect proves nothing: each port has to be
+# made to speak.
+PORTS = {"imap": 18993, "pop3": 18995, "submissions": 18465, "smtp": 18025}
+TLS_PORTS = {18993, 18995, 18465}
+SMTP_REFUSAL = ("535 5.7.0 This server allows only INBUXA webmail and JMAP apps. "
+                "This mail app can't send.")
+INBUXA = "urn:inbuxa:jmap"
+failures = []
+
+
+def check(cond, what):
+    print(("ok   " if cond else "FAIL ") + what)
+    if not cond:
+        failures.append(what)
+
+
+def secret_file(name, value=None):
+    path = f"{DIR}/secrets/{name}"
+    if value is None:
+        value = secrets.token_urlsafe(24)
+    with open(path, "w") as f:
+        f.write(value)
+    os.chmod(path, 0o600)
+    return value
+
+
+def docker(*args, check_rc=True):
+    return subprocess.run(["docker", *args], capture_output=True, text=True, check=check_rc)
+
+
+def start(env_file=None):
+    args = ["run", "-d", "--name", NAME, "--user", f"{os.getuid()}:{os.getgid()}",
+            "--entrypoint", "/usr/local/bin/inbuxa",
+            "-v", f"{ROOT}/target/debug/inbuxa:/usr/local/bin/inbuxa:ro",
+            "-v", f"{DIR}/etc-legacy:/etc/inbuxa", "-v", f"{DIR}/data-legacy:/var/lib/inbuxa",
+            "-p", "127.0.0.1:18080:8080",
+            "-p", f"127.0.0.1:{PORTS['submissions']}:465",
+            "-p", f"127.0.0.1:{PORTS['imap']}:993",
+            "-p", f"127.0.0.1:{PORTS['pop3']}:995",
+            "-p", f"127.0.0.1:{PORTS['smtp']}:25"]
+    if env_file:
+        args += ["--env-file", env_file]
+    args += ["stalwartlabs/stalwart:v0.16.22", "--config", "/etc/inbuxa/config.json"]
+    docker(*args)
+    for _ in range(120):
+        try:
+            urllib.request.urlopen(f"{HTTP}/.well-known/jmap", timeout=2)
+        except urllib.error.HTTPError:
+            return
+        except Exception:
+            time.sleep(1)
+            continue
+        return
+    sys.exit("server didn't come up: " + docker("logs", "--tail", "40", NAME, check_rc=False).stderr)
+
+
+def stop():
+    docker("rm", "-f", NAME, check_rc=False)
+
+
+def jmap(user, password, calls, using=("urn:ietf:params:jmap:core", "urn:stalwart:jmap", INBUXA)):
+    body = json.dumps({"using": list(using), "methodCalls": calls}).encode()
+    req = urllib.request.Request(f"{HTTP}/jmap/", data=body, method="POST")
+    req.add_header("Content-Type", "application/json")
+    req.add_header("Authorization", "Basic " + base64.b64encode(f"{user}:{password}".encode()).decode())
+    with urllib.request.urlopen(req, timeout=30) as resp:
+        return json.load(resp)["methodResponses"]
+
+
+def one(user, password, method, args):
+    return jmap(user, password, [[method, args, "0"]])[0]
+
+
+def session(user, password):
+    req = urllib.request.Request(f"{HTTP}/jmap/session")
+    req.add_header("Authorization", "Basic " + base64.b64encode(f"{user}:{password}".encode()).decode())
+    with urllib.request.urlopen(req, timeout=30) as resp:
+        return json.load(resp)
+
+
+def accepts(port, timeout=5):
+    """Whether a server is really answering on this port.
+
+    Docker's published port accepts and then closes when nothing is listening
+    in the container, so connecting is not enough. A TLS port must complete a
+    handshake; a plain one must send its greeting.
+    """
+    try:
+        with socket.create_connection(("127.0.0.1", port), timeout=timeout) as raw:
+            if port in TLS_PORTS:
+                ctx = ssl.create_default_context()
+                ctx.check_hostname = False
+                ctx.verify_mode = ssl.CERT_NONE
+                with ctx.wrap_socket(raw):
+                    return True
+            raw.settimeout(timeout)
+            return bool(raw.recv(1))
+    except (OSError, ssl.SSLError):
+        return False
+
+
+def tls(port, timeout=10):
+    ctx = ssl.create_default_context()
+    ctx.check_hostname = False
+    ctx.verify_mode = ssl.CERT_NONE
+    return ctx.wrap_socket(socket.create_connection(("127.0.0.1", port), timeout=timeout))
+
+
+def lines(sock):
+    """Yields reply lines, CRLF stripped."""
+    buf = b""
+    while True:
+        while b"\r\n" not in buf:
+            chunk = sock.recv(4096)
+            if not chunk:
+                return
+            buf += chunk
+        line, buf = buf.split(b"\r\n", 1)
+        yield line.decode(errors="replace")
+
+
+def imap_login(port, user, password):
+    """The tagged reply to LOGIN, over implicit TLS."""
+    with tls(port) as sock:
+        read = lines(sock)
+        next(read)  # greeting
+        quote = lambda v: '"' + v.replace("\\", "\\\\").replace('"', '\\"') + '"'
+        sock.sendall(f"a1 LOGIN {quote(user)} {quote(password)}\r\n".encode())
+        for line in read:
+            if line.startswith("a1 "):
+                return line[3:]
+    return ""
+
+
+def smtp_auths(port, user, passwords):
+    """The reply to AUTH PLAIN for each password in turn, on one connection.
+    A reply of "" means the server hung up."""
+    # Every connection reaches the server from Docker's gateway, one IP, and
+    # the stock inbound throttle takes five a second from it. The port checks
+    # just before can use those up, so wait the second out.
+    time.sleep(1.1)
+    replies = []
+    with tls(port) as sock:
+        read = lines(sock)
+        next(read)  # greeting
+        sock.sendall(b"EHLO e2e.test\r\n")
+        for line in read:
+            if line[3:4] == " ":
+                break
+        for password in passwords:
+            token = base64.b64encode(f"\0{user}\0{password}".encode()).decode()
+            try:
+                sock.sendall(f"AUTH PLAIN {token}\r\n".encode())
+                replies.append(next(read, ""))
+            except OSError:
+                replies.append("")
+    return replies
+
+
+def advertised(admin, admin_pw):
+    """What each client-configuration answer and the suggested zone offer."""
+    with urllib.request.urlopen(f"{HTTP}/mail/[email protected]",
+                                timeout=30) as resp:
+        autoconfig = resp.read().decode()
+    body = ('<?xml version="1.0" encoding="utf-8"?><Autodiscover xmlns="http://schemas.'
+            'microsoft.com/exchange/autodiscover/outlook/requestschema/2006"><Request>'
+            '<EMailAddress>[email protected]</EMailAddress><AcceptableResponseSchema>http://'
+            'schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a'
+            '</AcceptableResponseSchema></Request></Autodiscover>').encode()
+    req = urllib.request.Request(f"{HTTP}/autodiscover/autodiscover.xml", data=body, method="POST")
+    req.add_header("Content-Type", "text/xml")
+    with urllib.request.urlopen(req, timeout=30) as resp:
+        autodiscover = resp.read().decode()
+    with urllib.request.urlopen(f"{HTTP}/.well-known/user-agent-configuration.json",
+                                timeout=30) as resp:
+        pacc = json.load(resp).get("protocols", {})
+    got = one(admin, admin_pw, "x:Domain/get", {"ids": None, "properties": ["name", "dnsZoneFile"]})
+    zone = next((d.get("dnsZoneFile") or "" for d in got[1].get("list", [])
+                 if d.get("name") == "legacy.test"), "")
+    srv = {}
+    for line in zone.splitlines():
+        fields = line.split()
+        if "SRV" in fields and fields[0].startswith("_"):
+            srv[fields[0].split(".")[0] + "." + fields[0].split(".")[1]] = fields[-1]
+    return {
+        "autoconfig": {t for t in ("imap", "pop3", "smtp") if f'type="{t}"' in autoconfig},
+        "autodiscover": {t for t in ("IMAP", "POP3", "SMTP") if f"<Type>{t}</Type>" in autodiscover},
+        "pacc": {t for t in ("imap", "pop3", "smtp", "managesieve") if t in pacc},
+        "jmap": "jmap" in pacc,
+        "srv": srv,
+    }
+
+
+def settle(port, want, tries=30):
+    """Wait for a port to reach the wanted state, so the check is not a race."""
+    for _ in range(tries):
+        if accepts(port) == want:
+            return True
+        time.sleep(0.5)
+    return False
+
+
+def main():
+    stop()
+    # Start from nothing. A half-bootstrapped data directory left by an
+    # earlier run is no longer in bootstrap mode, and the recovery admin
+    # stops authenticating the moment a real admin exists.
+    for sub in ("etc-legacy", "data-legacy"):
+        shutil.rmtree(f"{DIR}/{sub}", ignore_errors=True)
+    for sub in ("etc-legacy", "data-legacy", "secrets"):
+        os.makedirs(f"{DIR}/{sub}", exist_ok=True)
+    os.chmod(f"{DIR}/secrets", 0o700)
+    stop()
+
+    # First boot, with a recovery admin from an env file.
+    recovery = secret_file("legacy-recovery")
+    env_file = f"{DIR}/secrets/legacy-env"
+    with open(env_file, "w") as f:
+        f.write(f"INBUXA_RECOVERY_ADMIN=admin:{recovery}\n")
+    os.chmod(env_file, 0o600)
+    start(env_file)
+
+    got = one("admin", recovery, "x:Bootstrap/get", {"ids": None})
+    singleton = got[1]["list"][0]["id"]
+    res = one("admin", recovery, "x:Bootstrap/set", {"update": {singleton: {
+        "serverHostname": "mail.legacy.test", "defaultDomain": "legacy.test",
+        "requestTlsCertificate": False}}})
+    updated = res[1].get("updated", {}).get(singleton)
+    check(bool(updated), "bootstrap completed")
+    if not updated:
+        sys.exit(json.dumps(res))
+    admin, admin_pw = updated["username"], secret_file("legacy-admin", updated["secret"])
+
+    stop()
+    start()
+
+    sess = session(admin, admin_pw)
+    account = sess["primaryAccounts"].get(INBUXA) or list(sess["accounts"])[0]
+    policy_get = {"accountId": account, "ids": None}
+    policy_set = lambda update: {"accountId": account, "update": {"singleton": update}}
+
+    # The ports we expect a default install to be accepting on.
+    check(accepts(PORTS["imap"]), "IMAP accepts before the switch")
+    check(accepts(PORTS["pop3"]), "POP3 accepts before the switch")
+    check(accepts(PORTS["submissions"]), "submission accepts before the switch")
+    check(accepts(PORTS["smtp"]), "inbound SMTP accepts before the switch")
+
+    # What is advertised with the switch on -- the control for LP-7.
+    before = advertised(admin, admin_pw)
+    print("     advertised before:", {k: sorted(v) if isinstance(v, set) else v
+                                      for k, v in before.items() if k != "srv"})
+    check(before["autoconfig"] and before["autodiscover"],
+          "autoconfig and autodiscover offer mail apps a server with the switch on")
+    check(before["srv"].get("_imaps._tcp", ".") != ".",
+          "the suggested zone offers IMAP with the switch on")
+
+    # A normal sign-in works with the switch on -- the control for LP-6.
+    check(imap_login(PORTS["imap"], admin, admin_pw).startswith("OK"),
+          "IMAP sign-in works with the switch on")
+    check(smtp_auths(PORTS["submissions"], admin, [admin_pw])[0].startswith("235"),
+          "submission sign-in works with the switch on")
+
+    # What the screen reads: the locked set and what would close (LP-16, LP-21).
+    got = one(admin, admin_pw, "inbuxa:ProtocolPolicy/get", policy_get)
+    if got[0] != "inbuxa:ProtocolPolicy/get":
+        sys.exit("ProtocolPolicy/get failed: " + json.dumps(got))
+    policy = got[1]["list"][0]
+    check(policy["legacyProtocols"] == "enabled", "switch starts enabled")
+    check(set(policy["lockedProtocols"]) >= {"smtp", "http"},
+          "SMTP and JMAP report as locked (LP-21)")
+    would = {l["id"] for l in policy["wouldClose"]}
+    print("     wouldClose:", sorted(would))
+    check(would, "wouldClose names the listeners that would close (LP-16)")
+
+    # Turn it off, and ask for submission to close too: the lock must overrule.
+    res = one(admin, admin_pw, "inbuxa:ProtocolPolicy/set",
+              policy_set({"legacyProtocols": "disabled", "closeSubmission": True}))
+    if not res[1].get("updated"):
+        sys.exit("ProtocolPolicy/set failed: " + json.dumps(res))
+    overruled = res[1]["updated"].get("singleton")
+    check(overruled is not None and overruled.get("closeSubmission") is False,
+          "closeSubmission overruled to false and reported (LP-21, test 18)")
+
+    # The ports themselves (LP-1, LP-2, LP-3, test 15).
+    check(settle(PORTS["imap"], False), "IMAP stopped accepting")
+    check(settle(PORTS["pop3"], False), "POP3 stopped accepting")
+    check(accepts(PORTS["smtp"]), "inbound SMTP still accepts (LP-3)")
+    check(accepts(PORTS["submissions"]), "submission still accepts, being locked (LP-21)")
+
+    # JMAP still works, which is the whole point of locking it.
+    got = one(admin, admin_pw, "inbuxa:ProtocolPolicy/get", policy_get)
+    check(got[0] == "inbuxa:ProtocolPolicy/get", "JMAP still works while the switch is off")
+    policy = got[1]["list"][0]
+    check(policy["legacyProtocols"] == "disabled", "switch reads back disabled")
+    saved = {l["id"] for l in policy["savedListeners"]}
+    print("     savedListeners:", sorted(saved))
+    check(saved, "the closed listeners were saved (LP-1)")
+
+    # The second lock (LP-6). Submission stays open, being locked, so sign-in
+    # over it is refused instead -- right password or wrong, the same words,
+    # and never enough of them to be thrown off (LP-11, test 2, test 18).
+    replies = smtp_auths(PORTS["submissions"], admin, [admin_pw] + ["wrong"] * 6)
+    check(replies[0] == SMTP_REFUSAL, "submission refuses the right password (LP-6)")
+    check(all(r == SMTP_REFUSAL for r in replies[1:]),
+          "submission refuses wrong passwords the same way, and doesn't hang up (LP-11)")
+    if not all(r == SMTP_REFUSAL for r in replies):
+        print("     replies:", replies)
+
+    # Nothing advertises what is closed (LP-7, test 5).
+    during = advertised(admin, admin_pw)
+    check(not during["autoconfig"], "autoconfig offers no IMAP, POP3 or submission (LP-7)")
+    check(not during["autodiscover"], "autodiscover offers no IMAP, POP3 or submission (LP-7)")
+    check(not during["pacc"] and during["jmap"], "PACC offers JMAP and nothing legacy (LP-7)")
+    names = ("_imap._tcp", "_imaps._tcp", "_pop3._tcp", "_pop3s._tcp",
+             "_submission._tcp", "_submissions._tcp")
+    offered = {n: t for n, t in during["srv"].items() if n in names and t != "."}
+    check(not offered and "_imaps._tcp" in during["srv"],
+          "the suggested zone marks the legacy SRV names not offered, target . (LP-7)")
+    if offered or "_imaps._tcp" not in during["srv"]:
+        print("     srv:", during["srv"])
+
+    # No listener the switch would close can be added while it is off (LP-4,
+    # test 4), and the refusal names the policy.
+    res = one(admin, admin_pw, "x:NetworkListener/set", {"create": {"m": {
+        "name": "imap-new", "protocol": "imap", "bind": {"0.0.0.0:1993": True},
+        "tlsImplicit": True}}})
+    refused = (res[1].get("notCreated") or {}).get("m") or {}
+    check(refused.get("type") == "invalidProperties"
+          and "protocol" in (refused.get("properties") or [])
+          and "inbuxa:ProtocolPolicy" in (refused.get("description") or ""),
+          "creating an IMAP listener is refused, naming the policy (LP-4)")
+    if not refused:
+        print("     reply:", json.dumps(res[1])[:300])
+
+    # What the switch never closes can still be added; turning it into a
+    # listener the switch would close is refused like creating one.
+    res = one(admin, admin_pw, "x:NetworkListener/set", {"create": {"s": {
+        "name": "submission-extra", "protocol": "smtp", "bind": {"0.0.0.0:2587": True}}}})
+    extra = (res[1].get("created") or {}).get("s", {}).get("id")
+    check(extra is not None, "an SMTP listener can still be created, being locked (LP-4, LP-21)")
+    if extra:
+        res = one(admin, admin_pw, "x:NetworkListener/set",
+                  {"update": {extra: {"protocol": "imap"}}})
+        refused = (res[1].get("notUpdated") or {}).get(extra) or {}
+        check(refused.get("type") == "invalidProperties",
+              "turning it into an IMAP listener is refused (LP-4)")
+        one(admin, admin_pw, "x:NetworkListener/set", {"destroy": [extra]})
+
+    # A restart must not reopen them: the objects are gone, not just the sockets.
+    stop()
+    start()
+    check(settle(PORTS["imap"], False), "IMAP still closed after a restart")
+    check(accepts(PORTS["smtp"]), "inbound SMTP still accepts after a restart")
+
+    # Turn it back on: the listeners come back and bind again (LP-5).
+    res = one(admin, admin_pw, "inbuxa:ProtocolPolicy/set",
+              policy_set({"legacyProtocols": "enabled"}))
+    if "updated" not in res[1]:
+        sys.exit("ProtocolPolicy/set back on failed: " + json.dumps(res))
+    check(settle(PORTS["imap"], True), "IMAP accepts again without a restart (LP-5)")
+    check(settle(PORTS["pop3"], True), "POP3 accepts again without a restart (LP-5)")
+
+    got = one(admin, admin_pw, "inbuxa:ProtocolPolicy/get", policy_get)
+    policy = got[1]["list"][0]
+    check(policy["legacyProtocols"] == "enabled", "switch reads back enabled")
+    check(not policy["savedListeners"], "savedListeners is empty again (LP-5)")
+
+    after = advertised(admin, admin_pw)
+    check(after["autoconfig"] == before["autoconfig"] and after["srv"] == before["srv"],
+          "autoconfig and the suggested zone offer them again once back on")
+
+    # And sign-in works again, with no restart.
+    check(imap_login(PORTS["imap"], admin, admin_pw).startswith("OK"),
+          "IMAP sign-in works again once the switch is back on")
+    check(smtp_auths(PORTS["submissions"], admin, [admin_pw])[0].startswith("235"),
+          "submission sign-in works again once the switch is back on")
+
+    print()
+    if failures:
+        print(f"{len(failures)} FAILED:")
+        for f in failures:
+            print("  - " + f)
+    else:
+        print("all checks passed")
+    return 1 if failures else 0
+
+
+if __name__ == "__main__":
+    rc = 1
+    try:
+        rc = main()
+    finally:
+        if not os.environ.get("KEEP"):
+            stop()
+    sys.exit(rc)