diff --git a/crates/jmap/src/inbuxa/fastmail.rs b/crates/jmap/src/inbuxa/fastmail.rs
index 0aade26..b7a696c 100644
--- a/crates/jmap/src/inbuxa/fastmail.rs
+++ b/crates/jmap/src/inbuxa/fastmail.rs
@@ -274,13 +274,18 @@ pub async fn set(
         }
         changed.enabled = new_state.is_live();
         if changed != mask.object {
-            let old = Object::from(mask.object.clone());
+            // The stored object carries the revision the write is checked against
+            let Some(old) = registry
+                .get(ObjectId::new(ObjectType::MaskedEmail, id))
+                .await?
+            else {
+                response.not_updated.append(id, SetError::not_found());
+                continue;
+            };
+            let mut new = old.clone();
+            new.inner = Object::from(changed.clone()).inner;
             match registry
-                .write(RegistryWrite::update(
-                    id,
-                    &Object::from(changed.clone()),
-                    &old,
-                ))
+                .write(RegistryWrite::update(id, &new, &old))
                 .await?
             {
                 RegistryWriteResult::Success(_) => {}
diff --git a/crates/jmap/src/inbuxa/masked_email.rs b/crates/jmap/src/inbuxa/masked_email.rs
index cbe8ee8..22330cd 100644
--- a/crates/jmap/src/inbuxa/masked_email.rs
+++ b/crates/jmap/src/inbuxa/masked_email.rs
@@ -186,7 +186,7 @@ impl CreateRefusal {
 /// `x:MaskedEmail/set`: a mask about to be created or changed (ME-12 to
 /// ME-17). On an update, the server-set and create-only fields keep their
 /// stored values.
-pub async fn validate(
+pub(crate) async fn validate(
     set: &RegistrySetResponse<'_>,
     mask: &mut MaskedEmail,
     old: Option<&MaskedEmail>,
@@ -285,7 +285,7 @@ pub async fn read(server: &Server, id: Id, mask: &mut MaskedEmail) -> trc::Resul
 
 /// `x:MaskedEmail/query`, which also filters on `enabled`, `forDomain` and
 /// text in the address and description (a fork addition).
-pub async fn query(mut req: RegistryQueryResponse<'_>) -> trc::Result<QueryResponseBuilder> {
+pub(crate) async fn query(mut req: RegistryQueryResponse<'_>) -> trc::Result<QueryResponseBuilder> {
     let account_id = req.request.account_id.document_id();
     assert_can_manage(req.server, req.access_token, account_id).await?;
 
diff --git a/tests/Cargo.toml b/tests/Cargo.toml
index 114b1ea..a64969a 100644
--- a/tests/Cargo.toml
+++ b/tests/Cargo.toml
@@ -45,6 +45,7 @@ pop3 = { path = "../crates/pop3", features = ["test_mode"] }
 smtp = { path = "../crates/smtp", features = ["test_mode"] }
 common = { path = "../crates/common", features = ["test_mode"] }
 registry = { path = "../crates/registry" }
+inbuxa-features = { path = "../crates/features" }
 email = { path = "../crates/email", features = ["test_mode"] }
 spam-filter = { path = "../crates/spam-filter", features = ["test_mode"] }
 trc = { path = "../crates/trc", features = [] }
diff --git a/tests/src/system/masked_email.rs b/tests/src/system/masked_email.rs
new file mode 100644
index 0000000..79f2baf
--- /dev/null
+++ b/tests/src/system/masked_email.rs
@@ -0,0 +1,628 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Coffey Labs
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+//! Masked email acceptance tests 1 to 11, from
+//! `docs/spec/features/masked-email.md`, with the additions the spec makes
+//! (ME-9, ME-10, ME-11, `/changes`). Each check names the test number or the
+//! requirement it covers. Test 12 (compat) needs a copy of INBUXA's data.
+
+use crate::utils::{
+    account::Account,
+    jmap::{JmapResponse, JmapUtils},
+    server::{TestServer, TestServerBuilder},
+    smtp::SmtpConnection,
+};
+use email::mailbox::{INBOX_ID, TRASH_ID};
+use inbuxa_features::masked_email::data;
+use jmap_proto::error::set::SetErrorType;
+use registry::schema::{
+    enums::StorageQuota,
+    prelude::{ObjectType, Property},
+    structs::{Expression, Imap, MaskedEmail, MtaStageAuth, MtaStageRcpt, UserRoles},
+};
+use serde_json::{Value, json};
+use store::write::BatchBuilder;
+use types::id::Id;
+use utils::map::vec_map::VecMap;
+
+const FASTMAIL: &str = "https://www.fastmail.com/dev/maskedemail";
+const SECRET_ALICE: &str = "alice keeps her masks close";
+const SECRET_BOB: &str = "bob would like to see them";
+const SECRET_RATE: &str = "rate tester makes many masks";
+const SECRET_T: &str = "tenant people on the mask test";
+
+pub async fn test(test: &mut TestServer) {
+    println!("Running masked email tests...");
+    let admin = test.account("admin@example.org");
+    admin.find_or_create_domain("example.org").await;
+    admin.find_or_create_domain("mask-alias.example.org").await;
+    admin.find_or_create_domain("not-linked.example.org").await;
+
+    let alice = admin
+        .create_user_account(
+            "alice@example.org",
+            SECRET_ALICE,
+            "Alice",
+            &["alice@mask-alias.example.org"],
+            vec![],
+        )
+        .await;
+    let bob = admin
+        .create_user_account("bob@example.org", SECRET_BOB, "Bob", &[], vec![])
+        .await;
+    let mut lmtp = SmtpConnection::connect().await;
+    // Refused recipients answer at once, so the refusals below are quick
+    admin
+        .registry_update_setting(
+            MtaStageRcpt {
+                wait_on_fail: Expression {
+                    else_: "1ms".into(),
+                    ..Default::default()
+                },
+                ..Default::default()
+            },
+            &[Property::WaitOnFail],
+        )
+        .await;
+    admin.reload_settings().await;
+
+    // Acceptance test 1: a Fastmail create with no arguments is pending, on
+    // the account's primary domain, and reads enabled in x: (ME-7a)
+    let pending = alice.fastmail_create(json!({})).await;
+    let pending_email = pending["email"].as_str().unwrap().to_string();
+    let pending_id = pending.object_id();
+    assert!(pending_email.ends_with("@example.org"), "test 1: {pending}");
+    assert!(
+        !pending_email.split('@').next().unwrap().contains('.'),
+        "ME-13: never upstream's shape"
+    );
+    assert_eq!(pending["state"], "pending", "test 1");
+    assert!(alice.x_mask(pending_id).await.enabled, "test 1: x: enabled");
+    // Through x: it starts enabled in both
+    let x_id = alice.x_create(json!({})).await;
+    assert_eq!(
+        alice.fastmail_state(x_id).await,
+        "enabled",
+        "test 1: x: create"
+    );
+
+    // Acceptance test 2: mail to a pending mask is delivered, the mask turns
+    // enabled and lastMessageAt is set (ME-7). It names the mask (ME-9).
+    let inbox_before = alice.count_in(INBOX_ID).await;
+    lmtp.ingest(
+        "sender@remote.example.org",
+        &[&pending_email],
+        &message("to a pending mask"),
+    )
+    .await;
+    alice.wait_for_count(INBOX_ID, inbox_before + 1).await;
+    let mask = alice.fastmail_get(pending_id).await;
+    assert_eq!(mask["state"], "enabled", "test 2");
+    assert!(mask["lastMessageAt"].is_string(), "test 2: {mask}");
+    assert_eq!(
+        alice.latest_header("X-Masked-Email").await.trim(),
+        pending_email,
+        "ME-9"
+    );
+
+    // ME-10: sub-addressing on a mask
+    let (local, domain) = pending_email.split_once('@').unwrap();
+    lmtp.ingest(
+        "sender@remote.example.org",
+        &[&format!("{local}+news@{domain}")],
+        &message("sub-addressed"),
+    )
+    .await;
+    alice.wait_for_count(INBOX_ID, inbox_before + 2).await;
+
+    // Acceptance test 3: a pending mask with no mail for 24 hours is removed
+    // and tombstoned (ME-8). Its deadline is moved into the past here.
+    let stale = alice.fastmail_create(json!({})).await;
+    let stale_id = stale.object_id();
+    let stale_email = stale["email"].as_str().unwrap().to_string();
+    test.expire_pending(stale_id).await;
+    assert!(
+        alice.fastmail_get_raw(stale_id).await["list"]
+            .as_array()
+            .unwrap()
+            .is_empty(),
+        "test 3"
+    );
+    assert_eq!(
+        test.tombstone(&stale_email).await,
+        Some(false),
+        "test 3: tombstoned"
+    );
+
+    // Acceptance test 4: disabled mail is accepted and lands in Trash (ME-5)
+    alice
+        .fastmail_update(pending_id, json!({"state": "disabled"}))
+        .await;
+    let trash_before = alice.count_in(TRASH_ID).await;
+    lmtp.ingest(
+        "sender@remote.example.org",
+        &[&pending_email],
+        &message("to a disabled mask"),
+    )
+    .await;
+    alice.wait_for_count(TRASH_ID, trash_before + 1).await;
+    assert!(
+        alice.x_mask(pending_id).await.enabled,
+        "disabled reads enabled in x:"
+    );
+
+    // Acceptance test 5: deleted, through either API, refuses mail at RCPT TO
+    // (ME-6), and both APIs agree (ME-2)
+    alice
+        .fastmail_update(pending_id, json!({"state": "deleted"}))
+        .await;
+    assert!(!alice.x_mask(pending_id).await.enabled, "test 5");
+    refused(&pending_email).await;
+    alice.x_update(pending_id, json!({"enabled": true})).await;
+    assert_eq!(alice.fastmail_state(pending_id).await, "enabled", "test 5");
+    alice.x_update(pending_id, json!({"enabled": false})).await;
+    assert_eq!(alice.fastmail_state(pending_id).await, "deleted", "test 5");
+    refused(&pending_email).await;
+    // ME-1: pending can't come back
+    alice
+        .fastmail_update_err(pending_id, json!({"state": "pending"}))
+        .await;
+
+    // Acceptance test 6: a destroyed mask is refused as unknown, and its
+    // address stays reserved (ME-3, ME-13)
+    alice.fastmail_destroy(pending_id).await;
+    refused(&pending_email).await;
+    assert_eq!(test.tombstone(&pending_email).await, Some(false), "test 6");
+
+    // Acceptance test 7: prefixes
+    let shop = alice
+        .x_get_email(alice.x_create(json!({"emailPrefix": "shop"})).await)
+        .await;
+    assert!(shop.starts_with("shop_"), "test 7: {shop}");
+    alice
+        .x_create_err(json!({"emailPrefix": "Shop!"}))
+        .await
+        .assert_type(SetErrorType::InvalidProperties);
+
+    // Acceptance test 8: domains (ME-12)
+    let aliased = alice
+        .x_get_email(
+            alice
+                .x_create(json!({"emailDomain": "mask-alias.example.org"}))
+                .await,
+        )
+        .await;
+    assert!(
+        aliased.ends_with("@mask-alias.example.org"),
+        "ME-12: {aliased}"
+    );
+    alice
+        .x_create_err(json!({"emailDomain": "not-linked.example.org"}))
+        .await
+        .assert_type(SetErrorType::Forbidden)
+        .assert_properties(&["emailDomain"]);
+
+    // ME-11: an owner sends as its mask; nobody else can
+    let identity = alice
+        .jmap_method_call(
+            "Identity/set",
+            json!({"accountId": alice.id_string(), "create": {"i": {"email": shop, "name": "Shop"}}}),
+        )
+        .await;
+    assert!(
+        identity
+            .0
+            .pointer("/methodResponses/0/1/created/i")
+            .is_some(),
+        "ME-11: {identity:?}"
+    );
+    let identity = bob
+        .jmap_method_call(
+            "Identity/set",
+            json!({"accountId": bob.id_string(), "create": {"i": {"email": shop, "name": "Shop"}}}),
+        )
+        .await;
+    assert!(
+        identity
+            .0
+            .pointer("/methodResponses/0/1/notCreated/i")
+            .is_some(),
+        "ME-11"
+    );
+
+    // Acceptance test 11: who reaches whose masks (ME-18, ME-19)
+    assert_eq!(
+        bob.x_list_for(&alice)
+            .await
+            .method_response()
+            .text_field("type"),
+        "forbidden",
+        "test 11: another user"
+    );
+    assert!(
+        admin.x_list_for(&alice).await.method_response()["list"]
+            .as_array()
+            .is_some_and(|list| !list.is_empty()),
+        "test 11: server admin"
+    );
+    let t_id = admin
+        .registry_create_object(registry::schema::structs::Tenant {
+            name: "Mask tenant".to_string(),
+            ..Default::default()
+        })
+        .await;
+    let t_domain = admin
+        .registry_create_object(registry::schema::structs::Domain {
+            name: "mask-tenant.example.org".to_string(),
+            is_enabled: true,
+            member_tenant_id: Some(t_id),
+            ..Default::default()
+        })
+        .await;
+    test.wait_for_tasks_skip_failures().await;
+    let t_admin = admin
+        .create_user_account(
+            "tadmin@mask-tenant.example.org",
+            SECRET_T,
+            "T admin",
+            &[],
+            vec![],
+        )
+        .await;
+    admin
+        .registry_update_object(
+            ObjectType::Account,
+            t_admin.id(),
+            json!({ Property::Roles: UserRoles::Admin }),
+        )
+        .await;
+    let t_user = admin
+        .create_user_account(
+            "tuser@mask-tenant.example.org",
+            SECRET_T,
+            "T user",
+            &[],
+            vec![],
+        )
+        .await;
+    t_user.x_create(json!({})).await;
+    assert!(
+        t_admin.x_list_for(&t_user).await.method_response()["list"]
+            .as_array()
+            .is_some_and(|list| list.len() == 1),
+        "test 11: tenant admin, own tenant"
+    );
+    assert_eq!(
+        t_admin
+            .x_list_for(&alice)
+            .await
+            .method_response()
+            .text_field("type"),
+        "forbidden",
+        "test 11: tenant admin, other accounts"
+    );
+
+    // x:MaskedEmail/changes (a fork addition)
+    let since = alice.x_state().await;
+    let new_id = alice.x_create(json!({})).await;
+    let changes = alice
+        .jmap_method_call(
+            "x:MaskedEmail/changes",
+            json!({"accountId": alice.id_string(), "sinceState": since}),
+        )
+        .await;
+    assert_eq!(
+        changes.method_response()["created"],
+        json!([new_id.to_string()]),
+        "/changes: {changes:?}"
+    );
+
+    // Acceptance test 9: maxMaskedAddresses (ME-14)
+    admin
+        .registry_update_object(
+            ObjectType::Account,
+            bob.id(),
+            json!({ Property::Quotas: VecMap::from_iter([(StorageQuota::MaxMaskedAddresses, 2u64)]) }),
+        )
+        .await;
+    bob.x_create(json!({})).await;
+    bob.x_create(json!({})).await;
+    bob.x_create_err(json!({}))
+        .await
+        .assert_type(SetErrorType::OverQuota);
+    admin
+        .registry_update_object(
+            ObjectType::Account,
+            bob.id(),
+            json!({ Property::Quotas: VecMap::from_iter([(StorageQuota::MaxMaskedAddresses, 0u64)]) }),
+        )
+        .await;
+    bob.x_create_err(json!({}))
+        .await
+        .assert_type(SetErrorType::OverQuota);
+
+    // Acceptance test 10: the 51st create in an hour is rate-limited (ME-15)
+    let rate = admin
+        .create_user_account("rate@example.org", SECRET_RATE, "Rate", &[], vec![])
+        .await;
+    // Above the server's default limit, so only the rate can stop it
+    admin
+        .registry_update_object(
+            ObjectType::Account,
+            rate.id(),
+            json!({ Property::Quotas: VecMap::from_iter([(StorageQuota::MaxMaskedAddresses, 1000u64)]) }),
+        )
+        .await;
+    for n in 0..50 {
+        let response = rate.fastmail_set(json!({"create": {"n": {}}})).await;
+        assert!(
+            response
+                .0
+                .pointer("/methodResponses/0/1/created/n")
+                .is_some(),
+            "create {n}: {response:?}"
+        );
+    }
+    let response = rate.fastmail_set(json!({"create": {"n": {}}})).await;
+    assert_eq!(
+        response
+            .0
+            .pointer("/methodResponses/0/1/notCreated/n/type")
+            .and_then(|v| v.as_str()),
+        Some("rateLimit"),
+        "test 10: {response:?}"
+    );
+
+    // Clean up
+    admin
+        .registry_update_setting(MtaStageRcpt::default(), &[Property::WaitOnFail])
+        .await;
+    admin.reload_settings().await;
+    for account in [alice, bob, rate, t_user, t_admin] {
+        admin.destroy_account(account).await;
+    }
+    test.wait_for_tasks().await;
+    admin.registry_destroy(ObjectType::Domain, [t_domain]).await;
+    admin.registry_destroy(ObjectType::Tenant, [t_id]).await;
+}
+
+/// Runs the masked email tests alone:
+/// `cargo test -p tests masked_email_tests -- --ignored`.
+#[ignore]
+#[tokio::test(flavor = "multi_thread")]
+pub async fn masked_email_tests() {
+    let mut test = TestServerBuilder::new("masked_email_tests")
+        .await
+        .with_default_listeners()
+        .await
+        .with_object(Imap {
+            allow_plain_text_auth: true,
+            ..Default::default()
+        })
+        .await
+        .with_object(MtaStageAuth {
+            require: Expression {
+                else_: "false".to_string(),
+                ..Default::default()
+            },
+            ..Default::default()
+        })
+        .await
+        .build()
+        .await;
+    let admin = test.create_admin_account("admin@example.org").await;
+    test.insert_account(admin);
+    self::test(&mut test).await;
+    if test.is_reset() {
+        test.temp_dir.delete();
+    }
+}
+
+fn message(subject: &str) -> String {
+    format!(
+        "From: sender@remote.example.org\r\nTo: someone@example.org\r\nSubject: {subject}\r\n\r\nHello.\r\n"
+    )
+}
+
+impl TestServer {
+    async fn expire_pending(&self, id: Id) {
+        let data_store = &self.server.core.storage.data;
+        let mut record = data::record(data_store, id).await.unwrap().unwrap();
+        record.pending_until = Some(1);
+        let mut batch = BatchBuilder::new();
+        data::set_record(&mut batch, id, &record).unwrap();
+        data_store.write(batch.build_all()).await.unwrap();
+    }
+
+    /// `Some(live)` when the address is in the fork's index.
+    async fn tombstone(&self, address: &str) -> Option<bool> {
+        data::address(&self.server.core.storage.data, address)
+            .await
+            .unwrap()
+            .map(|entry| entry.live)
+    }
+}
+
+/// ME-6: refused at RCPT TO with upstream's reply, on a fresh connection.
+async fn refused(address: &str) {
+    let mut lmtp = SmtpConnection::connect().await;
+    lmtp.mail_from("sender@remote.example.org", 2).await;
+    let reply = lmtp.rcpt_to(address, 5).await;
+    assert!(
+        reply.iter().any(|line| line.starts_with("550 5.1.2")),
+        "ME-6: {reply:?}"
+    );
+}
+
+impl Account {
+    async fn fastmail_set(&self, args: Value) -> JmapResponse {
+        let mut args = args;
+        args["accountId"] = json!(self.id_string());
+        self.jmap_request(
+            &["urn:ietf:params:jmap:core", FASTMAIL],
+            json!([["MaskedEmail/set", args, "0"]]),
+        )
+        .await
+    }
+
+    async fn fastmail_create(&self, object: Value) -> Value {
+        let response = self.fastmail_set(json!({"create": {"n": object}})).await;
+        response
+            .0
+            .pointer("/methodResponses/0/1/created/n")
+            .unwrap_or_else(|| panic!("not created: {response:?}"))
+            .clone()
+    }
+
+    async fn fastmail_update(&self, id: Id, object: Value) {
+        let response = self
+            .fastmail_set(json!({"update": {id.to_string(): object}}))
+            .await;
+        assert!(
+            response
+                .0
+                .pointer(&format!("/methodResponses/0/1/updated/{id}"))
+                .is_some(),
+            "not updated: {response:?}"
+        );
+    }
+
+    async fn fastmail_update_err(&self, id: Id, object: Value) {
+        let response = self
+            .fastmail_set(json!({"update": {id.to_string(): object}}))
+            .await;
+        assert!(
+            response
+                .0
+                .pointer(&format!("/methodResponses/0/1/notUpdated/{id}"))
+                .is_some(),
+            "updated: {response:?}"
+        );
+    }
+
+    async fn fastmail_destroy(&self, id: Id) {
+        let response = self
+            .fastmail_set(json!({"destroy": [id.to_string()]}))
+            .await;
+        assert_eq!(
+            response.method_response()["destroyed"],
+            json!([id.to_string()]),
+            "{response:?}"
+        );
+    }
+
+    async fn fastmail_get_raw(&self, id: Id) -> Value {
+        self.jmap_request(
+            &["urn:ietf:params:jmap:core", FASTMAIL],
+            json!([["MaskedEmail/get", {"accountId": self.id_string(), "ids": [id.to_string()]}, "0"]]),
+        )
+        .await
+        .method_response()
+        .clone()
+    }
+
+    async fn fastmail_get(&self, id: Id) -> Value {
+        let response = self.fastmail_get_raw(id).await;
+        response["list"][0].clone()
+    }
+
+    async fn fastmail_state(&self, id: Id) -> String {
+        self.fastmail_get(id).await["state"]
+            .as_str()
+            .unwrap_or_default()
+            .to_string()
+    }
+
+    async fn x_create(&self, object: Value) -> Id {
+        self.registry_create_many(ObjectType::MaskedEmail, [object])
+            .await
+            .created_id(0)
+    }
+
+    async fn x_create_err(&self, object: Value) -> crate::utils::jmap::JmapSetError {
+        self.registry_create_many(ObjectType::MaskedEmail, [object])
+            .await
+            .not_created(0)
+            .to_set_error()
+    }
+
+    async fn x_update(&self, id: Id, object: Value) {
+        self.registry_update_object(ObjectType::MaskedEmail, id, object)
+            .await;
+    }
+
+    async fn x_mask(&self, id: Id) -> MaskedEmail {
+        self.registry_get::<MaskedEmail>(id).await
+    }
+
+    async fn x_get_email(&self, id: Id) -> String {
+        self.x_mask(id).await.email
+    }
+
+    async fn x_list_for(&self, owner: &Account) -> JmapResponse {
+        self.jmap_method_call(
+            "x:MaskedEmail/get",
+            json!({"accountId": owner.id_string(), "ids": null}),
+        )
+        .await
+    }
+
+    async fn x_state(&self) -> String {
+        self.x_list_for(self).await.method_response()["state"]
+            .as_str()
+            .unwrap_or_default()
+            .to_string()
+    }
+
+    async fn count_in(&self, mailbox_id: u32) -> usize {
+        self.jmap_method_call(
+            "Email/query",
+            json!({
+                "accountId": self.id_string(),
+                "filter": {"inMailbox": Id::from(mailbox_id).to_string()}
+            }),
+        )
+        .await
+        .method_response()["ids"]
+            .as_array()
+            .map(|ids| ids.len())
+            .unwrap_or(0)
+    }
+
+    async fn wait_for_count(&self, mailbox_id: u32, count: usize) {
+        for _ in 0..40 {
+            if self.count_in(mailbox_id).await >= count {
+                return;
+            }
+            tokio::time::sleep(std::time::Duration::from_millis(250)).await;
+        }
+        panic!(
+            "mailbox {mailbox_id} of {} never reached {count} messages",
+            self.name()
+        );
+    }
+
+    async fn latest_header(&self, header: &str) -> String {
+        let response = self
+            .jmap_method_calls(json!([
+                ["Email/query", {
+                    "accountId": self.id_string(),
+                    "sort": [{"property": "receivedAt", "isAscending": false}],
+                    "limit": 1
+                }, "q"],
+                ["Email/get", {
+                    "accountId": self.id_string(),
+                    "#ids": {"resultOf": "q", "name": "Email/query", "path": "/ids"},
+                    "properties": [format!("header:{header}:asText")]
+                }, "g"]
+            ]))
+            .await;
+        response.0["methodResponses"][1][1]["list"][0][format!("header:{header}:asText")]
+            .as_str()
+            .unwrap_or_default()
+            .to_string()
+    }
+}
diff --git a/tests/src/system/mod.rs b/tests/src/system/mod.rs
index 0c5c79b..699547f 100644
--- a/tests/src/system/mod.rs
+++ b/tests/src/system/mod.rs
@@ -10,6 +10,7 @@ pub mod authorization;
 pub mod crypto;
 pub mod delivery;
 pub mod directory;
+pub mod masked_email;
 pub mod oidc;
 pub mod purge;
 pub mod quota;
@@ -62,6 +63,7 @@ pub async fn system_tests() {
     oidc::test(&mut test).await;
     authorization::test(&mut test).await;
     tenant::test(&mut test).await;
+    masked_email::test(&mut test).await;
     security::test(&mut test).await;
     quota::test(&mut test).await;
     purge::test(&mut test).await;