chore: News fragments

- enabling the `http3` features requires unstable features, namely `reqwest_unstable`
- the main suggestion of cargo is to enable this through RUSTFLAGS
- we had no way to customize RUSTFLAGS, now we do
- changed the max-perf package to showcase this feature
- also turn on http3 by default in both max-perf and the default build
  (jade approved this)

.forgejo/workflows/auto-labeler.yml

@@ -0,0 +1,53 @@
+name: Auto Labeler
+
+on:
+  pull_request_target:
+    types: [opened, reopened]
+
+permissions:
+  contents: read
+  pull-requests: write
+  issues: write
+
+jobs:
+  auto-label:
+    name: Apply labels based on changed files
+    runs-on: ubuntu-latest
+    steps:
+      - name: Apply PR Labels
+        uses: https://github.com/actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9
+        with:
+          script: |
+            const allFiles = await github.paginate(github.rest.pulls.listFiles, {
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pull_number: context.issue.number,
+            });
+
+            const fileNames = allFiles.map(f => f.filename);
+            const labelsToAdd = new Set();
+
+            for (const file of fileNames) {
+              if (file.startsWith('docs/') || file.startsWith('theme/') || file.endsWith('.md') || file == 'rspress.config.ts') {
+                labelsToAdd.add('Documentation');
+              }
+              if (file.startsWith('.forgejo/')) {
+                labelsToAdd.add('Meta/CI');
+              }
+              if (file.startsWith('pkg/') || file.startsWith('nix/') || file === 'flake.nix' || file === 'flake.lock' || file.startsWith('docker/')) {
+                labelsToAdd.add('Meta/Packaging');
+              }
+            }
+
+            if (labelsToAdd.size > 0) {
+              const labelsArray = Array.from(labelsToAdd);
+              console.log('Adding labels:', labelsArray);
+              await github.rest.issues.addLabels({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number,
+                labels: labelsArray,
+              });
+            } else {
+              console.log('No files changed that require auto-labeling.');
+            }

.forgejo/workflows/build-debian.yml

@@ -92,10 +92,13 @@ jobs:
           BASE_VERSION=$(cargo metadata --no-deps --format-version 1 | jq -r ".packages[] | select(.name == \"conduwuit\").version" | sed 's/[^a-zA-Z0-9.+]/~/g')
           # VERSION is the package version, COMPONENT is used in
           # apt's repository config like a git repo branch
-          if [[ "${{ forge.ref }}" == "refs/tags/"* ]]; then
+          VERSION=$BASE_VERSION
-            # Use the "stable" component for tagged releases
+          if [[ ${{ forge.ref_name }} =~ ^v+[0-9]\.+[0-9]\.+[0-9]$ ]]; then
+            # Use the "stable" component for tagged semver releases
             COMPONENT="stable"
-            VERSION=$BASE_VERSION
+          elif [[ ${{ forge.ref }} =~ ^refs/tags/^v+[0-9]\.+[0-9]\.+[0-9] ]]; then
+            # Use the "unstable" component for tagged semver pre-releases
+            COMPONENT="unstable"
           else
             # Use the "dev" component for development builds
             SHA=$(echo "${{ forge.sha }}" | cut -c1-7)

CHANGELOG.md

@@ -1,3 +1,45 @@
+# Continuwuity v0.5.7 (2026-04-17)
+
+## Features
+
+- Re-added support for reading registration tokens from a file. Contributed by @ginger and @benbot. (#1371)
+- Add new config option to allow or disallow search engine indexing through a `<meta ../>` tag. Defaults to blocking indexing (`content="noindex"`). Contributed by @s1lv3r and @ginger. (#1527)
+- Add new config option for [MSC4439](https://github.com/matrix-org/matrix-spec-proposals/pull/4439)
+  PGP key URIs. Contributed by LogN. (#1609)
+- Added `!admin users reset-push-rules` command to reset the notification settings of users. Contributed by @nex. (#1613)
+- Notification pushers are now automatically removed when their associated device is. Admin commands now exist for manual cleanup too. Contributed by @nex. (#1614)
+- Implemented option to deprioritize servers for room join requests. Contributed by @ezera. (#1624)
+- Added admin commands to get build information and features. Contributed by @Jade (#1629)
+- Added support for associating email addresses with accounts, requiring email addresses for registration, and resetting passwords via email. Contributed by @ginger
+- Added support for requiring users to accept terms and conditions when registering.
+- Added support for using an admin command to issue self-service password reset links.
+
+## Bugfixes
+
+- Fixed corrupted appservice registrations causing the server to enter a crash loop. Contributed by @nex. (#1265)
+- Prevent removing the admin room alias (`#admins`) to avoid accidentally breaking admin room functionality. Contributed by @0xnim (#1448)
+- Stripped `join_authorised_via_users_server` from json if user is already in room (@partha:cxy.run) (#1542)
+- Fixed internal server errors for fetching thumbnails. Contributed by @PerformativeJade (#1572)
+- Fixed error 500 when joining non-existent rooms. Contributed by @ezera. (#1579)
+- Refactored nix package. Breaking, since `all-features` package no longer exists. Continuwuity is now built with jemalloc and liburing by default. Contributed by @Henry-Hiles (QuadRadical). (#1596)
+- Fixed resolving IP of servers that only use SRV delegation. Contributed by @tulir. (#1615)
+- Fixed "Sender must be a local user" error for make_join, make_knock, and make_leave federation routes. Contributed by @nex. (#1623)
+- Fixed restricted joins not being signed when we are being used as an authorising server. Contributed by @nex, reported by [vel](matrix:u/vel:nhjkl.com?action=chat). (#1630)
+- Fixed room alias deletion so removing one local alias no longer removes other aliases from room alias listings.
+- Stopped left rooms from being unconditionally sent on initial sync, hopefully fixing spurious appearances of left rooms in some clients (and making sync faster as a bonus). Contributed by @ginger
+- Correct the response field name for MatrixRTC transports. Contributed by @spaetz
+
+## Improved Documentation
+
+- Added Testing and Troubleshooting instructions for Livekit documentation. Contributed by @stratself. (#1429)
+- Refactored docker docs to include new initial token workflow, and add Caddyfile example. Contributed by @stratself. (#1594)
+- Add DNS tuning guide for Continuwuity. Users are recommended to set up a local caching resolver following the guide's advice. Contributed by @stratself (#1601)
+
+## Misc
+
+- Fixed compiler warning in cf_opts.rs when building in release. Contributed by @ezera. (#1620)
+
+
 # Continuwuity 0.5.6 (2026-03-03)
 
 ## Security

Cargo.lock

@@ -848,9 +848,9 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "4.6.0"
+version = "4.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b193af5b67834b676abd72466a96c1024e6a6ad978a1f484bd90b85c94041351"
+checksum = "1ddb117e43bbf7dacf0a4190fef4d345b9bad68dfc649cb349e7d17d28428e51"
 dependencies = [
  "clap_builder",
  "clap_derive",
@@ -868,9 +868,9 @@ dependencies = [
 
 [[package]]
 name = "clap_derive"
-version = "4.6.0"
+version = "4.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1110bd8a634a1ab8cb04345d8d878267d57c3cf1b38d91b71af6686408bbca6a"
+checksum = "f2ce8604710f6733aa641a2b3731eaa1e8b3d9973d5e3565da11800813f997a9"
 dependencies = [
  "heck",
  "proc-macro2",
@@ -936,7 +936,7 @@ dependencies = [
 
 [[package]]
 name = "conduwuit"
-version = "0.5.7-alpha.2"
+version = "0.5.7"
 dependencies = [
  "clap",
  "conduwuit_admin",
@@ -970,7 +970,7 @@ dependencies = [
 
 [[package]]
 name = "conduwuit_admin"
-version = "0.5.7-alpha.2"
+version = "0.5.7"
 dependencies = [
  "clap",
  "conduwuit_api",
@@ -993,7 +993,7 @@ dependencies = [
 
 [[package]]
 name = "conduwuit_api"
-version = "0.5.7-alpha.2"
+version = "0.5.7"
 dependencies = [
  "async-trait",
  "axum",
@@ -1028,7 +1028,7 @@ dependencies = [
 
 [[package]]
 name = "conduwuit_build_metadata"
-version = "0.5.7-alpha.2"
+version = "0.5.7"
 dependencies = [
  "built",
  "cargo_metadata",
@@ -1036,7 +1036,7 @@ dependencies = [
 
 [[package]]
 name = "conduwuit_core"
-version = "0.5.7-alpha.2"
+version = "0.5.7"
 dependencies = [
  "argon2",
  "arrayvec",
@@ -1100,7 +1100,7 @@ dependencies = [
 
 [[package]]
 name = "conduwuit_database"
-version = "0.5.7-alpha.2"
+version = "0.5.7"
 dependencies = [
  "async-channel",
  "conduwuit_core",
@@ -1120,7 +1120,7 @@ dependencies = [
 
 [[package]]
 name = "conduwuit_macros"
-version = "0.5.7-alpha.2"
+version = "0.5.7"
 dependencies = [
  "cargo_toml",
  "itertools 0.14.0",
@@ -1131,7 +1131,7 @@ dependencies = [
 
 [[package]]
 name = "conduwuit_router"
-version = "0.5.7-alpha.2"
+version = "0.5.7"
 dependencies = [
  "axum",
  "axum-client-ip",
@@ -1167,7 +1167,7 @@ dependencies = [
 
 [[package]]
 name = "conduwuit_service"
-version = "0.5.7-alpha.2"
+version = "0.5.7"
 dependencies = [
  "askama",
  "async-trait",
@@ -1214,7 +1214,7 @@ dependencies = [
 
 [[package]]
 name = "conduwuit_web"
-version = "0.5.7-alpha.2"
+version = "0.5.7"
 dependencies = [
  "askama",
  "async-trait",
@@ -1906,7 +1906,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "39cab71617ae0d63f51a36d69f866391735b51691dbda63cf6f96d042b63efeb"
 dependencies = [
  "libc",
- "windows-sys 0.61.2",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -3475,7 +3475,7 @@ version = "0.50.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7957b9740744892f114936ab4a57b3f487491bbeafaf8083688b16841a4240e5"
 dependencies = [
- "windows-sys 0.61.2",
+ "windows-sys 0.60.2",
 ]
 
 [[package]]
@@ -4845,7 +4845,7 @@ dependencies = [
  "errno",
  "libc",
  "linux-raw-sys",
- "windows-sys 0.61.2",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -5446,7 +5446,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3a766e1110788c36f4fa1c2b71b387a7815aa65f88ce0229841826633d93723e"
 dependencies = [
  "libc",
- "windows-sys 0.61.2",
+ "windows-sys 0.60.2",
 ]
 
 [[package]]
@@ -5749,9 +5749,9 @@ checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
 
 [[package]]
 name = "tokio"
-version = "1.51.1"
+version = "1.52.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f66bf9585cda4b724d3e78ab34b73fb2bbaba9011b9bfdf69dc836382ea13b8c"
+checksum = "b67dee974fe86fd92cc45b7a95fdd2f99a36a6d7b0d431a231178d3d670bbcc6"
 dependencies = [
  "bytes",
  "libc",
@@ -6578,7 +6578,7 @@ version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c2a7b1c03c876122aa43f3020e6c3c3ee5c05081c9a00739faf7503aeba10d22"
 dependencies = [
- "windows-sys 0.61.2",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -6920,7 +6920,7 @@ dependencies = [
 
 [[package]]
 name = "xtask"
-version = "0.5.7-alpha.2"
+version = "0.5.7"
 dependencies = [
  "askama",
  "cargo_metadata",

Cargo.toml

@@ -12,7 +12,7 @@ license = "Apache-2.0"
 # See also `rust-toolchain.toml`
 readme = "README.md"
 repository = "https://forgejo.ellis.link/continuwuation/continuwuity"
-version = "0.5.7-alpha.2"
+version = "0.5.7"
 
 [workspace.metadata.crane]
 name = "conduwuit"

changelog.d/+1608cdcb.feature.md

@@ -0,0 +1 @@
+Users will now be prevented from removing their email if the server is configured to require an email when registering an account.

changelog.d/+1770db35.feature.md

@@ -1 +0,0 @@
-Added support for associating email addresses with accounts, requiring email addresses for registration, and resetting passwords via email. Contributed by @ginger

changelog.d/+6368729a.feature.md

@@ -1 +0,0 @@
-Added support for using an admin command to issue self-service password reset links.

changelog.d/+6e57599d.bugfix.md

@@ -1 +0,0 @@
-Stopped left rooms from being unconditionally sent on initial sync, hopefully fixing spurious appearances of left rooms in some clients (and making sync faster as a bonus). Contributed by @ginger

changelog.d/+7409b1db.feature.md

@@ -1 +0,0 @@
-Added support for requiring users to accept terms and conditions when registering.

changelog.d/+alias-enumeration-delete.bugfix.md

@@ -1 +0,0 @@
-Fixed room alias deletion so removing one local alias no longer removes other aliases from room alias listings.

changelog.d/+e82957a7.bugfix.md

@@ -0,0 +1 @@
+Fixed a situation where multiple email addresses could be associated with one user when that user changes their email address.

changelog.d/1265.bugfix

@@ -1 +0,0 @@
-Fixed corrupted appservice registrations causing the server to enter a crash loop. Contributed by @nex.

changelog.d/1371.feature.md

@@ -1 +0,0 @@
-Re-added support for reading registration tokens from a file. Contributed by @ginger and @benbot.

changelog.d/1429.doc

@@ -1 +0,0 @@
-Added Testing and Troubleshooting instructions for Livekit documentation. Contributed by @stratself.

changelog.d/1448.bugfix

@@ -1 +0,0 @@
-Prevent removing the admin room alias (`#admins`) to avoid accidentally breaking admin room functionality. Contributed by @0xnim

changelog.d/1527.feature.md

@@ -1 +0,0 @@
-Add new config option to allow or disallow search engine indexing through a `<meta ../>` tag. Defaults to blocking indexing (`content="noindex"`). Contributed by @s1lv3r and @ginger.

changelog.d/1542.bugfix.md

@@ -1 +0,0 @@
-Stripped `join_authorised_via_users_server` from json if user is already in room (@partha:cxy.run)

changelog.d/1572.bugfix

@@ -1 +0,0 @@
-Fixed internal server errors for fetching thumbnails. Contributed by @PerformativeJade

changelog.d/1579.bugfix

@@ -1 +0,0 @@
-Fixed error 500 when joining non-existent rooms. Contributed by @ezera.

changelog.d/1594.doc

@@ -1 +0,0 @@
-Refactored docker docs to include new initial token workflow, and add Caddyfile example. Contributed by @stratself.

changelog.d/1596.bugfix

@@ -1 +0,0 @@
-Refactored nix package. Breaking, since `all-features` package no longer exists. Continuwuity is now built with jemalloc and liburing by default. Contributed by @Henry-Hiles (QuadRadical).

changelog.d/1601.doc

@@ -1 +0,0 @@
-Add DNS tuning guide for Continuwuity. Users are recommended to set up a local caching resolver following the guide's advice. Contributed by @stratself

changelog.d/1609.feature.md

@@ -1,2 +0,0 @@
-Add new config option for [MSC4439](https://github.com/matrix-org/matrix-spec-proposals/pull/4439)
-PGP key URIs. Contributed by LogN.

changelog.d/1613.feature

@@ -1 +0,0 @@
-Added `!admin users reset-push-rules` command to reset the notification settings of users. Contributed by @nex.

changelog.d/1614.feature

@@ -1 +0,0 @@
-Notification pushers are now automatically removed when their associated device is. Admin commands now exist for manual cleanup too. Contributed by @nex.

changelog.d/1615.bugfix

@@ -1 +0,0 @@
-Fixed resolving IP of servers that only use SRV delegation. Contributed by @tulir.

changelog.d/1620.misc

@@ -1 +0,0 @@
-Fixed compiler warning in cf_opts.rs when building in release. Contributed by @ezera.

changelog.d/1622.doc

@@ -0,0 +1 @@
+Updated config docs to state we support room version 12, and set it as default. Contributed by @ezera.

changelog.d/1623.bugfix

@@ -1 +0,0 @@
-Fixed "Sender must be a local user" error for make_join, make_knock, and make_leave federation routes. Contributed by @nex.

changelog.d/1624.feature

@@ -1 +0,0 @@
-Implemented option to deprioritize servers for room join requests. Contributed by @ezera.

changelog.d/1629.feature.md

@@ -1 +0,0 @@
-Added admin commands to get build information and features. Contributed by @Jade

changelog.d/1630.bugfix

@@ -1 +0,0 @@
-Fixed restricted joins not being signed when we are being used as an authorising server. Contributed by @nex, reported by [vel](matrix:u/vel:nhjkl.com?action=chat).

conduwuit-example.toml

@@ -619,7 +619,7 @@
 # Set to false to disable users from joining or creating room versions
 # that aren't officially supported by continuwuity.
 #
-# continuwuity officially supports room versions 6 - 11.
+# continuwuity officially supports room versions 6 - 12.
 #
 # continuwuity has slightly experimental (though works fine in practice)
 # support for versions 3 - 5.
@@ -631,9 +631,9 @@
 # rather than an integer. Forgetting the quotes will make the server fail
 # to start!
 #
-# Per spec, room version "11" is the default.
+# Per spec, room version "12" is the default.
 #
-#default_room_version = "11"
+#default_room_version = "12"
 
 # Enable OpenTelemetry OTLP tracing export. This replaces the deprecated
 # Jaeger exporter. Traces will be sent via OTLP to a collector (such as
@@ -2104,6 +2104,9 @@
 # Whether to require that users provide an email address when they
 # register.
 #
+# If either this option or `require_email_for_token_registration` are set,
+# users will not be allowed to remove their email address.
+#
 #require_email_for_registration = false
 
 # Whether to require that users who register with a registration token

docs/public/.well-known/continuwuity/announcements

@@ -6,10 +6,10 @@
             "message": "Welcome to Continuwuity! Important announcements about the project will appear here."
         },
         {
-            "id": 10,
+            "id": 11,
             "mention_room": false,
-            "date": "2026-03-03",
+            "date": "2026-04-17",
-            "message": "We've just released [v0.5.6](https://forgejo.ellis.link/continuwuation/continuwuity/releases/tag/v0.5.6), which contains a few  security improvements - plus significant reliability and performance improvements. Please update as soon as possible. \n\nWe released [v0.5.5](https://forgejo.ellis.link/continuwuation/continuwuity/releases/tag/v0.5.5) two weeks ago, but it skipped your admin room straight to [our announcements channel](https://matrix.to/#/!jIdNjSM5X-V5JVx2h2kAhUZIIQ08GyzPL55NFZAH1vM?via=ellis.link&via=gingershaped.computer&via=matrix.org). Make sure you're there to get important information as soon as we announce it! [Our space](https://matrix.to/#/!8cR4g-i9ucof69E4JHNg9LbPVkGprHb3SzcrGBDDJgk?via=continuwuity.org&via=ellis.link&via=matrix.org) has also gained a bunch of new and interesting rooms - be there or be square."
+            "message": "[v0.5.7](https://forgejo.ellis.link/continuwuation/continuwuity/releases/tag/v0.5.7) is out! Email verification! Terms and Conditions! Deleting notification pushers! So much good stuff. Go grab the release and read the changelog!"
         }
     ]
 }

nix/packages/continuwuity.nix

@@ -8,7 +8,9 @@
   callPackage,
   rustPlatform,
   cargoExtraArgs ? "",
+  rustflags ? "",
   rocksdb ? callPackage ./rocksdb.nix { },
+  profile ? "release",
 }:
 let
   # see https://crane.dev/API.html#cranelibfiltercargosources
@@ -35,6 +37,8 @@ let
     env = {
       ROCKSDB_INCLUDE_DIR = "${rocksdb}/include";
       ROCKSDB_LIB_DIR = "${rocksdb}/lib";
+      CARGO_PROFILE = profile;
+      RUSTFLAGS = rustflags;
     };
   };
 in

nix/packages/default.nix

@@ -5,6 +5,7 @@
 {
   perSystem =
     {
+      self',
       pkgs,
       craneLib,
       ...
@@ -12,7 +13,22 @@
     {
       packages = {
         rocksdb = pkgs.callPackage ./rocksdb.nix { };
-        default = pkgs.callPackage ./continuwuity.nix { inherit self craneLib; };
+        default = pkgs.callPackage ./continuwuity.nix {
+          inherit self craneLib;
+          # extra features via `cargoExtraArgs`
+          cargoExtraArgs = "-F http3";
+          # extra RUSTFLAGS via `rustflags`
+          # the stuff below is required for http3
+          rustflags = "--cfg reqwest_unstable";
+        };
+        # users may also override this with other cargo profiles to build for other feature sets
+        #
+        # other examples include:
+        #
+        # - release-high-perf
+        max-perf = self'.packages.default.override {
+          profile = "release-max-perf";
+        };
       };
     };
 }

pkg/debian/README.md

@@ -6,7 +6,9 @@ This document provides information about downloading and deploying the Debian pa
 
 To add the Continuwuation apt repository:
 ```bash
-# Replace with `"dev"` for bleeding-edge builds at your own risk
+# Component `"stable"` contains all tagged releases. Use `"stable unstable"` to additionally include all pre-releases (alpha, beta, rc,...)
+# Replace with `"dev"` for bleeding-edge builds at your own risk, these contain
+# automatic nightly builds and might or might not work.
 export COMPONENT="stable"
 # Import the Continuwuation signing key
 sudo curl https://forgejo.ellis.link/api/packages/continuwuation/debian/repository.key -o /etc/apt/keyrings/forgejo-continuwuation.asc

src/api/client/account/threepid.rs

@@ -53,6 +53,10 @@ pub(crate) async fn request_3pid_management_token_via_email_route(
 	State(services): State<crate::State>,
 	body: Ruma<request_3pid_management_token_via_email::v3::Request>,
 ) -> Result<request_3pid_management_token_via_email::v3::Response> {
+	if !services.threepid.email_requirement().may_change() {
+		return Err!(Request(Forbidden("You may not change your email address.")));
+	}
+
 	let Ok(email) = Address::try_from(body.email.clone()) else {
 		return Err!(Request(InvalidParam("Invalid email address.")));
 	};
@@ -105,6 +109,10 @@ pub(crate) async fn add_3pid_route(
 ) -> Result<add_3pid::v3::Response> {
 	let sender_user = body.sender_user();
 
+	if !services.threepid.email_requirement().may_change() {
+		return Err!(Request(Forbidden("You may not change your email address.")));
+	}
+
 	// Require password auth to add an email
 	let _ = services
 		.uiaa
@@ -138,6 +146,10 @@ pub(crate) async fn delete_3pid_route(
 		});
 	}
 
+	if !services.threepid.email_requirement().may_remove() {
+		return Err!(Request(Forbidden("You may not remove your email address.")));
+	}
+
 	if services
 		.threepid
 		.disassociate_localpart_email(sender_user.localpart())

src/api/client/capabilities.rs

@@ -32,7 +32,7 @@ pub(crate) async fn get_capabilities_route(
 
 	// Only allow 3pid changes if SMTP is configured
 	capabilities.thirdparty_id_changes = ThirdPartyIdChangesCapability {
-		enabled: services.mailer.mailer().is_some(),
+		enabled: services.threepid.email_requirement().may_change(),
 	};
 
 	capabilities.get_login_token = GetLoginTokenCapability {

src/core/config/mod.rs

@@ -753,7 +753,7 @@ pub struct Config {
 	/// Set to false to disable users from joining or creating room versions
 	/// that aren't officially supported by continuwuity.
 	///
-	/// continuwuity officially supports room versions 6 - 11.
+	/// continuwuity officially supports room versions 6 - 12.
 	///
 	/// continuwuity has slightly experimental (though works fine in practice)
 	/// support for versions 3 - 5.
@@ -765,9 +765,9 @@ pub struct Config {
 	/// rather than an integer. Forgetting the quotes will make the server fail
 	/// to start!
 	///
-	/// Per spec, room version "11" is the default.
+	/// Per spec, room version "12" is the default.
 	///
-	/// default: "11"
+	/// default: "12"
 	#[serde(default = "default_default_room_version")]
 	pub default_room_version: RoomVersionId,
 
@@ -2516,6 +2516,9 @@ pub struct SmtpConfig {
 	/// Whether to require that users provide an email address when they
 	/// register.
 	///
+	/// If either this option or `require_email_for_token_registration` are set,
+	/// users will not be allowed to remove their email address.
+	///
 	/// default: false
 	#[serde(default)]
 	pub require_email_for_registration: bool,
@@ -2545,7 +2548,6 @@ const DEPRECATED_KEYS: &[&str] = &[
 	"well_known_support_role",
 	"well_known_support_email",
 	"well_known_support_mxid",
-	"registration_token_file",
 	"well_known.rtc_focus_server_urls",
 ];
 
@@ -2828,7 +2830,7 @@ fn default_rocksdb_stats_level() -> u8 { 1 }
 // I know, it's a great name
 #[must_use]
 #[inline]
-pub fn default_default_room_version() -> RoomVersionId { RoomVersionId::V11 }
+pub fn default_default_room_version() -> RoomVersionId { RoomVersionId::V12 }
 
 fn default_ip_range_denylist() -> Vec<String> {
 	vec![

src/service/sending/sender.rs

@@ -9,6 +9,7 @@ use std::{
 };
 
 use base64::{Engine as _, engine::general_purpose::URL_SAFE_NO_PAD};
+use conduwuit::info;
 use conduwuit_core::{
 	Error, Event, Result, at, debug, err, error,
 	result::LogErr,
@@ -866,9 +867,12 @@ impl Service {
 
 		for (event_id, result) in result.iter().flat_map(|resp| resp.pdus.iter()) {
 			if let Err(e) = result {
-				warn!(
+				info!(
-					%txn_id, %server,
+					%txn_id,
-					"error sending PDU {event_id} to remote server: {e:?}"
+					%server,
+					%event_id,
+					remote_error=?e,
+					"remote server encountered an error while processing an event"
 				);
 			}
 		}

src/service/threepid/mod.rs

@@ -25,6 +25,23 @@ pub struct Service {
 	ratelimiter: DefaultKeyedRateLimiter<Address>,
 }
 
+pub enum EmailRequirement {
+	/// Users may change their email, but cannot remove it entirely.
+	Required,
+	/// Users may change or remove their email.
+	Optional,
+	/// Users may not change their email at all.
+	Unavailable,
+}
+
+impl EmailRequirement {
+	#[must_use]
+	pub fn may_change(&self) -> bool { matches!(self, Self::Required | Self::Optional) }
+
+	#[must_use]
+	pub fn may_remove(&self) -> bool { matches!(self, Self::Optional) }
+}
+
 struct Data {
 	localpart_email: Arc<Map>,
 	email_localpart: Arc<Map>,
@@ -64,6 +81,19 @@ impl Service {
 		Quota::per_minute(nonzero!(10_u32)).allow_burst(nonzero!(2_u32));
 	const VALIDATION_URL_PATH: &str = "/_continuwuity/3pid/email/validate";
 
+	/// Check if users are required to have an email address.
+	pub fn email_requirement(&self) -> EmailRequirement {
+		if let Some(smtp) = &self.services.config.smtp {
+			if smtp.require_email_for_registration || smtp.require_email_for_token_registration {
+				EmailRequirement::Required
+			} else {
+				EmailRequirement::Optional
+			}
+		} else {
+			EmailRequirement::Unavailable
+		}
+	}
+
 	/// Send a validation message to an email address.
 	///
 	/// Returns the validation session ID on success.
@@ -234,6 +264,9 @@ impl Service {
 			| None => {
 				// The supplied email is not already in use.
 
+				// Remove the user's existing email first.
+				let _ = self.disassociate_localpart_email(localpart).await;
+
 				let email: &str = email.as_ref();
 				self.db.localpart_email.insert(localpart, email);
 				self.db.email_localpart.insert(email, localpart);