diff --git a/lib/core/db_schema_version.dart b/lib/core/db_schema_version.dart
index 85e2c74..2379cdd 100644
--- a/lib/core/db_schema_version.dart
+++ b/lib/core/db_schema_version.dart
@@ -1 +1 @@
-const int dbSchemaVersion = 34;
+const int dbSchemaVersion = 36;
diff --git a/lib/core/models/user_preferences.dart b/lib/core/models/user_preferences.dart
index 9a806d5..598ab88 100644
--- a/lib/core/models/user_preferences.dart
+++ b/lib/core/models/user_preferences.dart
@@ -1,6 +1,14 @@
 enum MenuPosition { bottom, top }
 
+enum AfterMailViewAction { nextMessage, showMailbox }
+
 class UserPreferences {
-  const UserPreferences({this.menuPosition = MenuPosition.bottom});
+  const UserPreferences({
+    this.menuPosition = MenuPosition.bottom,
+    this.mailViewButtonPosition = MenuPosition.bottom,
+    this.afterMailViewAction = AfterMailViewAction.nextMessage,
+  });
   final MenuPosition menuPosition;
+  final MenuPosition mailViewButtonPosition;
+  final AfterMailViewAction afterMailViewAction;
 }
diff --git a/lib/core/repositories/user_preferences_repository.dart b/lib/core/repositories/user_preferences_repository.dart
index c2f5333..4b26113 100644
--- a/lib/core/repositories/user_preferences_repository.dart
+++ b/lib/core/repositories/user_preferences_repository.dart
@@ -3,4 +3,6 @@ import 'package:sharedinbox/core/models/user_preferences.dart';
 abstract class UserPreferencesRepository {
   Stream<UserPreferences> observePreferences();
   Future<void> updateMenuPosition(MenuPosition position);
+  Future<void> updateMailViewButtonPosition(MenuPosition position);
+  Future<void> updateAfterMailViewAction(AfterMailViewAction action);
 }
diff --git a/lib/data/db/database.dart b/lib/data/db/database.dart
index 9619849..01164d5 100644
--- a/lib/data/db/database.dart
+++ b/lib/data/db/database.dart
@@ -313,6 +313,12 @@ class UserPreferences extends Table {
   IntColumn get id => integer()();
   // 'bottom' (default) | 'top'
   TextColumn get menuPosition => text().withDefault(const Constant('bottom'))();
+  // Added in schema v35: 'bottom' (default) | 'top'
+  TextColumn get mailViewButtonPosition =>
+      text().withDefault(const Constant('bottom'))();
+  // Added in schema v36: 'nextMessage' (default) | 'showMailbox'
+  TextColumn get afterMailViewAction =>
+      text().withDefault(const Constant('nextMessage'))();
 
   @override
   Set<Column> get primaryKey => {id};
@@ -593,6 +599,18 @@ class AppDatabase extends _$AppDatabase {
           if (from < 34) {
             await m.createTable(userPreferences);
           }
+          if (from >= 34 && from < 35) {
+            await m.addColumn(
+              userPreferences,
+              userPreferences.mailViewButtonPosition,
+            );
+          }
+          if (from >= 34 && from < 36) {
+            await m.addColumn(
+              userPreferences,
+              userPreferences.afterMailViewAction,
+            );
+          }
         },
       );
 }
diff --git a/lib/data/repositories/user_preferences_repository_impl.dart b/lib/data/repositories/user_preferences_repository_impl.dart
index 71535df..ca02c07 100644
--- a/lib/data/repositories/user_preferences_repository_impl.dart
+++ b/lib/data/repositories/user_preferences_repository_impl.dart
@@ -26,6 +26,28 @@ class UserPreferencesRepositoryImpl implements UserPreferencesRepository {
         );
   }
 
+  @override
+  Future<void> updateMailViewButtonPosition(pref.MenuPosition position) async {
+    await _db.into(_db.userPreferences).insertOnConflictUpdate(
+          UserPreferencesCompanion(
+            id: const Value(_rowId),
+            mailViewButtonPosition: Value(position.name),
+          ),
+        );
+  }
+
+  @override
+  Future<void> updateAfterMailViewAction(
+    pref.AfterMailViewAction action,
+  ) async {
+    await _db.into(_db.userPreferences).insertOnConflictUpdate(
+          UserPreferencesCompanion(
+            id: const Value(_rowId),
+            afterMailViewAction: Value(action.name),
+          ),
+        );
+  }
+
   static pref.UserPreferences _rowToModel(UserPreferencesRow? row) {
     if (row == null) return const pref.UserPreferences();
     return pref.UserPreferences(
@@ -33,6 +55,14 @@ class UserPreferencesRepositoryImpl implements UserPreferencesRepository {
         (e) => e.name == row.menuPosition,
         orElse: () => pref.MenuPosition.bottom,
       ),
+      mailViewButtonPosition: pref.MenuPosition.values.firstWhere(
+        (e) => e.name == row.mailViewButtonPosition,
+        orElse: () => pref.MenuPosition.bottom,
+      ),
+      afterMailViewAction: pref.AfterMailViewAction.values.firstWhere(
+        (e) => e.name == row.afterMailViewAction,
+        orElse: () => pref.AfterMailViewAction.nextMessage,
+      ),
     );
   }
 }
diff --git a/lib/ui/screens/email_detail_screen.dart b/lib/ui/screens/email_detail_screen.dart
index 7a8f4a8..c0246ae 100644
--- a/lib/ui/screens/email_detail_screen.dart
+++ b/lib/ui/screens/email_detail_screen.dart
@@ -13,6 +13,7 @@ import 'package:share_plus/share_plus.dart';
 
 import 'package:sharedinbox/core/models/email.dart';
 import 'package:sharedinbox/core/models/undo_action.dart';
+import 'package:sharedinbox/core/models/user_preferences.dart';
 import 'package:sharedinbox/core/utils/format_utils.dart';
 import 'package:sharedinbox/core/utils/html_utils.dart';
 import 'package:sharedinbox/di.dart';
@@ -98,6 +99,7 @@ class _EmailDetailScreenState extends ConsumerState<EmailDetailScreen> {
             icon: const Icon(Icons.delete),
             tooltip: 'Delete',
             onPressed: () async {
+              final nextEmailId = await _getNextEmailIdIfNeeded(header);
               final destPath = await repo.deleteEmail(widget.emailId);
 
               if (header != null) {
@@ -116,7 +118,7 @@ class _EmailDetailScreenState extends ConsumerState<EmailDetailScreen> {
                 );
               }
 
-              if (context.mounted) context.pop();
+              if (context.mounted) _navigateTo(context, header, nextEmailId);
             },
           ),
           IconButton(
@@ -171,8 +173,9 @@ class _EmailDetailScreenState extends ConsumerState<EmailDetailScreen> {
             ],
             onSelected: (value) async {
               if (value == 'mark_unread') {
+                final nextEmailId = await _getNextEmailIdIfNeeded(header);
                 await repo.setFlag(widget.emailId, seen: false);
-                if (context.mounted) context.pop();
+                if (context.mounted) _navigateTo(context, header, nextEmailId);
               } else if (value == 'headers' && body != null) {
                 _showHeaders(context, body);
               } else if (value == 'structure' && body != null) {
@@ -252,6 +255,39 @@ class _EmailDetailScreenState extends ConsumerState<EmailDetailScreen> {
     );
   }
 
+  Future<String?> _getNextEmailIdIfNeeded(Email? header) async {
+    if (header == null) return null;
+    final prefs = ref.read(userPreferencesProvider).value;
+    final action =
+        prefs?.afterMailViewAction ?? AfterMailViewAction.nextMessage;
+    if (action != AfterMailViewAction.nextMessage) return null;
+
+    final threads = await ref
+        .read(emailRepositoryProvider)
+        .observeThreads(header.accountId, header.mailboxPath)
+        .first;
+
+    final currentIndex =
+        threads.indexWhere((t) => t.emailIds.contains(widget.emailId));
+    if (currentIndex >= 0 && currentIndex + 1 < threads.length) {
+      return threads[currentIndex + 1].latestEmailId;
+    }
+    return null;
+  }
+
+  void _navigateTo(BuildContext context, Email? header, String? nextEmailId) {
+    if (!context.mounted) return;
+    if (nextEmailId != null && header != null) {
+      context.go(
+        '/accounts/${header.accountId}'
+        '/mailboxes/${Uri.encodeComponent(header.mailboxPath)}'
+        '/emails/${Uri.encodeComponent(nextEmailId)}',
+      );
+    } else {
+      context.pop();
+    }
+  }
+
   Future<void> _downloadAndOpen(EmailAttachment att) async {
     setState(() => _downloading.add(att.filename));
     try {
@@ -403,6 +439,9 @@ class _EmailDetailScreenState extends ConsumerState<EmailDetailScreen> {
   }
 
   Future<void> _archive(BuildContext context, Email header) async {
+    final nextEmailId = await _getNextEmailIdIfNeeded(header);
+    if (!context.mounted) return;
+
     final mailbox = await resolveMailboxByRole(
       context,
       ref.read(mailboxRepositoryProvider),
@@ -432,10 +471,13 @@ class _EmailDetailScreenState extends ConsumerState<EmailDetailScreen> {
           ),
     );
 
-    if (context.mounted) context.pop();
+    if (context.mounted) _navigateTo(context, header, nextEmailId);
   }
 
   Future<void> _markAsSpam(BuildContext context, Email header) async {
+    final nextEmailId = await _getNextEmailIdIfNeeded(header);
+    if (!context.mounted) return;
+
     final mailbox = await resolveMailboxByRole(
       context,
       ref.read(mailboxRepositoryProvider),
@@ -465,7 +507,7 @@ class _EmailDetailScreenState extends ConsumerState<EmailDetailScreen> {
           ),
     );
 
-    if (context.mounted) context.pop();
+    if (context.mounted) _navigateTo(context, header, nextEmailId);
   }
 
   Future<void> _forward(
@@ -490,6 +532,8 @@ class _EmailDetailScreenState extends ConsumerState<EmailDetailScreen> {
   }
 
   Future<void> _moveTo(BuildContext context, Email header) async {
+    final nextEmailId = await _getNextEmailIdIfNeeded(header);
+
     final mailboxRepo = ref.read(mailboxRepositoryProvider);
     final mailboxes =
         await mailboxRepo.observeMailboxes(header.accountId).first;
@@ -538,10 +582,13 @@ class _EmailDetailScreenState extends ConsumerState<EmailDetailScreen> {
           ),
     );
 
-    if (context.mounted) context.pop();
+    if (context.mounted) _navigateTo(context, header, nextEmailId);
   }
 
   Future<void> _snooze(BuildContext context, Email header) async {
+    final nextEmailId = await _getNextEmailIdIfNeeded(header);
+    if (!context.mounted) return;
+
     final until = await showModalBottomSheet<DateTime>(
       context: context,
       builder: (ctx) => const SnoozePicker(),
@@ -569,7 +616,7 @@ class _EmailDetailScreenState extends ConsumerState<EmailDetailScreen> {
           ),
         ),
       );
-      context.pop();
+      _navigateTo(context, header, nextEmailId);
     }
   }
 
diff --git a/lib/ui/screens/thread_detail_screen.dart b/lib/ui/screens/thread_detail_screen.dart
index 4178bcb..6f6549c 100644
--- a/lib/ui/screens/thread_detail_screen.dart
+++ b/lib/ui/screens/thread_detail_screen.dart
@@ -7,6 +7,7 @@ import 'package:intl/intl.dart';
 
 import 'package:sharedinbox/core/models/email.dart';
 import 'package:sharedinbox/core/models/undo_action.dart';
+import 'package:sharedinbox/core/models/user_preferences.dart';
 import 'package:sharedinbox/core/utils/html_utils.dart';
 import 'package:sharedinbox/di.dart';
 import 'package:sharedinbox/ui/widgets/secure_email_webview.dart';
@@ -28,9 +29,16 @@ class ThreadDetailScreen extends ConsumerWidget {
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     final repo = ref.watch(emailRepositoryProvider);
+    final prefs =
+        ref.watch(userPreferencesProvider).value ?? const UserPreferences();
+    final buttonAtBottom = prefs.mailViewButtonPosition == MenuPosition.bottom;
 
     return Scaffold(
-      appBar: AppBar(title: const Text('Thread')),
+      appBar: AppBar(
+        title: const Text('Thread'),
+        automaticallyImplyLeading: !buttonAtBottom,
+      ),
+      bottomNavigationBar: buttonAtBottom ? _buildBackButtonBar(context) : null,
       body: StreamBuilder<List<Email>>(
         stream: repo.observeEmailsInThread(accountId, mailboxPath, threadId),
         builder: (context, snapshot) {
@@ -60,6 +68,20 @@ class ThreadDetailScreen extends ConsumerWidget {
       ),
     );
   }
+
+  Widget _buildBackButtonBar(BuildContext context) {
+    return BottomAppBar(
+      child: Row(
+        children: [
+          IconButton(
+            icon: const Icon(Icons.arrow_back),
+            tooltip: 'Back',
+            onPressed: () => context.pop(),
+          ),
+        ],
+      ),
+    );
+  }
 }
 
 class _EmailMessageCard extends ConsumerStatefulWidget {
diff --git a/lib/ui/screens/user_preferences_screen.dart b/lib/ui/screens/user_preferences_screen.dart
index af18ffe..e1dd6de 100644
--- a/lib/ui/screens/user_preferences_screen.dart
+++ b/lib/ui/screens/user_preferences_screen.dart
@@ -59,6 +59,84 @@ class UserPreferencesScreen extends ConsumerWidget {
                 ],
               ),
             ),
+            const Divider(),
+            ListTile(
+              title: Text(
+                'Single mail view button position',
+                style: Theme.of(context).textTheme.titleSmall,
+              ),
+              subtitle: const Text(
+                'Where the back button is shown in the single mail view.',
+              ),
+            ),
+            RadioGroup<MenuPosition>(
+              groupValue: prefs.mailViewButtonPosition,
+              onChanged: (value) {
+                if (value == null) return;
+                unawaited(
+                  ref
+                      .read(userPreferencesRepositoryProvider)
+                      .updateMailViewButtonPosition(value),
+                );
+              },
+              child: const Column(
+                children: [
+                  RadioListTile<MenuPosition>(
+                    title: Text('Bottom (default)'),
+                    subtitle: Text(
+                      'Show the back button at the bottom of the screen.',
+                    ),
+                    value: MenuPosition.bottom,
+                  ),
+                  RadioListTile<MenuPosition>(
+                    title: Text('Top'),
+                    subtitle: Text(
+                      'Show the back button in the top bar.',
+                    ),
+                    value: MenuPosition.top,
+                  ),
+                ],
+              ),
+            ),
+            const Divider(),
+            ListTile(
+              title: Text(
+                'After mail action',
+                style: Theme.of(context).textTheme.titleSmall,
+              ),
+              subtitle: const Text(
+                'What to show after deleting, archiving, or otherwise handling a message.',
+              ),
+            ),
+            RadioGroup<AfterMailViewAction>(
+              groupValue: prefs.afterMailViewAction,
+              onChanged: (value) {
+                if (value == null) return;
+                unawaited(
+                  ref
+                      .read(userPreferencesRepositoryProvider)
+                      .updateAfterMailViewAction(value),
+                );
+              },
+              child: const Column(
+                children: [
+                  RadioListTile<AfterMailViewAction>(
+                    title: Text('Next message (default)'),
+                    subtitle: Text(
+                      'Show the next message in the mailbox.',
+                    ),
+                    value: AfterMailViewAction.nextMessage,
+                  ),
+                  RadioListTile<AfterMailViewAction>(
+                    title: Text('Return to mailbox'),
+                    subtitle: Text(
+                      'Return to the message list.',
+                    ),
+                    value: AfterMailViewAction.showMailbox,
+                  ),
+                ],
+              ),
+            ),
           ],
         ),
       ),
diff --git a/test/unit/migration_test.dart b/test/unit/migration_test.dart
index aff972b..ac36bab 100644
--- a/test/unit/migration_test.dart
+++ b/test/unit/migration_test.dart
@@ -14,7 +14,7 @@ void main() {
   group('Migration', () {
     test('schemaVersion matches expected value', () async {
       final db = AppDatabase(NativeDatabase.memory());
-      expect(db.schemaVersion, 34);
+      expect(db.schemaVersion, 36);
       await db.close();
     });
 
@@ -202,6 +202,13 @@ void main() {
       // v34: user_preferences table.
       await db.customSelect('SELECT count(*) FROM user_preferences').get();
 
+      // v35: mail_view_button_position column on user_preferences.
+      final userPrefsColumns = await _tableColumns(db, 'user_preferences');
+      expect(userPrefsColumns, contains('mail_view_button_position'));
+
+      // v36: after_mail_view_action column on user_preferences.
+      expect(userPrefsColumns, contains('after_mail_view_action'));
+
       await db.close();
       if (dbFile.existsSync()) dbFile.deleteSync();
     });
@@ -397,11 +404,18 @@ void main() {
       // v34: user_preferences table.
       await db.customSelect('SELECT count(*) FROM user_preferences').get();
 
+      // v35: mail_view_button_position column on user_preferences.
+      final userPrefsColumns = await _tableColumns(db, 'user_preferences');
+      expect(userPrefsColumns, contains('mail_view_button_position'));
+
+      // v36: after_mail_view_action column on user_preferences.
+      expect(userPrefsColumns, contains('after_mail_view_action'));
+
       await db.close();
       if (dbFile.existsSync()) dbFile.deleteSync();
     });
 
-    test('fresh install creates all tables at schemaVersion 34', () async {
+    test('fresh install creates all tables at schemaVersion 36', () async {
       final db = AppDatabase(NativeDatabase.memory());
       await db.select(db.accounts).get();
 
@@ -448,6 +462,13 @@ void main() {
       expect(syncLogColumns, contains('error_stack_trace'));
       expect(syncLogColumns, contains('is_permanent'));
 
+      // v35: mail_view_button_position column on user_preferences.
+      final userPrefsColumns = await _tableColumns(db, 'user_preferences');
+      expect(userPrefsColumns, contains('mail_view_button_position'));
+
+      // v36: after_mail_view_action column on user_preferences.
+      expect(userPrefsColumns, contains('after_mail_view_action'));
+
       await db.close();
     });
   });
diff --git a/test/widget/helpers.dart b/test/widget/helpers.dart
index 208ab0d..bfb0360 100644
--- a/test/widget/helpers.dart
+++ b/test/widget/helpers.dart
@@ -414,6 +414,7 @@ class _NoOpManageSieveProbeService implements ManageSieveProbeService {
 Widget buildApp({
   required String initialLocation,
   required List<Override> overrides,
+  UserPreferencesRepository? userPreferences,
 }) {
   final testRouter = GoRouter(
     initialLocation: initialLocation,
@@ -523,7 +524,7 @@ Widget buildApp({
         const NoOpSyncLogRepository(),
       ),
       userPreferencesRepositoryProvider.overrideWithValue(
-        FakeUserPreferencesRepository(),
+        userPreferences ?? FakeUserPreferencesRepository(),
       ),
       ...overrides,
       manageSieveProbeServiceProvider.overrideWith(
@@ -624,18 +625,37 @@ Email testEmail({
 class FakeUserPreferencesRepository implements UserPreferencesRepository {
   FakeUserPreferencesRepository({
     this.menuPosition = MenuPosition.bottom,
+    this.mailViewButtonPosition = MenuPosition.bottom,
+    this.afterMailViewAction = AfterMailViewAction.nextMessage,
   });
 
   MenuPosition menuPosition;
+  MenuPosition mailViewButtonPosition;
+  AfterMailViewAction afterMailViewAction;
 
   @override
-  Stream<UserPreferences> observePreferences() =>
-      Stream.value(UserPreferences(menuPosition: menuPosition));
+  Stream<UserPreferences> observePreferences() => Stream.value(
+        UserPreferences(
+          menuPosition: menuPosition,
+          mailViewButtonPosition: mailViewButtonPosition,
+          afterMailViewAction: afterMailViewAction,
+        ),
+      );
 
   @override
   Future<void> updateMenuPosition(MenuPosition position) async {
     menuPosition = position;
   }
+
+  @override
+  Future<void> updateMailViewButtonPosition(MenuPosition position) async {
+    mailViewButtonPosition = position;
+  }
+
+  @override
+  Future<void> updateAfterMailViewAction(AfterMailViewAction action) async {
+    afterMailViewAction = action;
+  }
 }
 
 class FakeSearchHistoryRepository implements SearchHistoryRepository {
diff --git a/test/widget/thread_detail_screen_test.dart b/test/widget/thread_detail_screen_test.dart
index 44fd8f3..e61f19d 100644
--- a/test/widget/thread_detail_screen_test.dart
+++ b/test/widget/thread_detail_screen_test.dart
@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 import 'package:sharedinbox/core/models/email.dart';
+import 'package:sharedinbox/core/models/user_preferences.dart';
 import 'package:sharedinbox/di.dart';
 
 import 'helpers.dart';
@@ -142,6 +143,60 @@ void main() {
       expect(find.byIcon(Icons.expand_more), findsOneWidget);
     });
 
+    testWidgets('shows bottom app bar with back button by default', (
+      tester,
+    ) async {
+      final email = _threadEmail();
+      await tester.pumpWidget(
+        buildApp(
+          initialLocation: '/accounts/acc-1/mailboxes/INBOX/threads/thread-1',
+          overrides: [
+            accountRepositoryProvider.overrideWithValue(
+              FakeAccountRepository([kTestAccount]),
+            ),
+            mailboxRepositoryProvider.overrideWithValue(
+              FakeMailboxRepository(),
+            ),
+            emailRepositoryProvider.overrideWithValue(
+              FakeEmailRepository(emails: [email]),
+            ),
+          ],
+        ),
+      );
+      await tester.pumpAndSettle();
+
+      expect(find.byType(BottomAppBar), findsOneWidget);
+      expect(find.byIcon(Icons.arrow_back), findsOneWidget);
+    });
+
+    testWidgets('hides bottom app bar when button position is top', (
+      tester,
+    ) async {
+      final email = _threadEmail();
+      await tester.pumpWidget(
+        buildApp(
+          initialLocation: '/accounts/acc-1/mailboxes/INBOX/threads/thread-1',
+          userPreferences: FakeUserPreferencesRepository(
+            mailViewButtonPosition: MenuPosition.top,
+          ),
+          overrides: [
+            accountRepositoryProvider.overrideWithValue(
+              FakeAccountRepository([kTestAccount]),
+            ),
+            mailboxRepositoryProvider.overrideWithValue(
+              FakeMailboxRepository(),
+            ),
+            emailRepositoryProvider.overrideWithValue(
+              FakeEmailRepository(emails: [email]),
+            ),
+          ],
+        ),
+      );
+      await tester.pumpAndSettle();
+
+      expect(find.byType(BottomAppBar), findsNothing);
+    });
+
     testWidgets('flagged email shows star icon', (tester) async {
       final email = _threadEmail(isFlagged: true);
       await tester.pumpWidget(
diff --git a/test/widget/user_preferences_screen_test.dart b/test/widget/user_preferences_screen_test.dart
index 61ff92f..d41db2f 100644
--- a/test/widget/user_preferences_screen_test.dart
+++ b/test/widget/user_preferences_screen_test.dart
@@ -20,11 +20,13 @@ void main() {
       await tester.pumpAndSettle();
 
       expect(find.text('Menu bar position'), findsOneWidget);
-      expect(find.text('Bottom (default)'), findsOneWidget);
-      expect(find.text('Top'), findsOneWidget);
+      expect(find.text('Bottom (default)'), findsNWidgets(2));
+      expect(find.text('Top'), findsNWidgets(2));
     });
 
-    testWidgets('bottom option is selected by default', (tester) async {
+    testWidgets('shows single mail view button position section', (
+      tester,
+    ) async {
       await tester.pumpWidget(
         buildApp(
           initialLocation: '/accounts/preferences',
@@ -33,12 +35,15 @@ void main() {
       );
       await tester.pumpAndSettle();
 
-      final radioGroup = find.byType(RadioGroup<MenuPosition>);
-      final widget = tester.widget<RadioGroup<MenuPosition>>(radioGroup);
-      expect(widget.groupValue, MenuPosition.bottom);
+      expect(
+        find.text('Single mail view button position'),
+        findsOneWidget,
+      );
     });
 
-    testWidgets('tapping Top option updates the repo', (tester) async {
+    testWidgets('menu position bottom option is selected by default', (
+      tester,
+    ) async {
       await tester.pumpWidget(
         buildApp(
           initialLocation: '/accounts/preferences',
@@ -47,7 +52,41 @@ void main() {
       );
       await tester.pumpAndSettle();
 
-      await tester.tap(find.text('Top'));
+      final radioGroups = find.byType(RadioGroup<MenuPosition>);
+      final menuGroup =
+          tester.widget<RadioGroup<MenuPosition>>(radioGroups.first);
+      expect(menuGroup.groupValue, MenuPosition.bottom);
+    });
+
+    testWidgets('mail view button position bottom is selected by default', (
+      tester,
+    ) async {
+      await tester.pumpWidget(
+        buildApp(
+          initialLocation: '/accounts/preferences',
+          overrides: baseOverrides(),
+        ),
+      );
+      await tester.pumpAndSettle();
+
+      final radioGroups = find.byType(RadioGroup<MenuPosition>);
+      final mailViewGroup =
+          tester.widget<RadioGroup<MenuPosition>>(radioGroups.last);
+      expect(mailViewGroup.groupValue, MenuPosition.bottom);
+    });
+
+    testWidgets('tapping Top in menu position section updates the repo', (
+      tester,
+    ) async {
+      await tester.pumpWidget(
+        buildApp(
+          initialLocation: '/accounts/preferences',
+          overrides: baseOverrides(),
+        ),
+      );
+      await tester.pumpAndSettle();
+
+      await tester.tap(find.text('Top').first);
       await tester.pumpAndSettle();
 
       final repo = ProviderScope.containerOf(
@@ -57,5 +96,91 @@ void main() {
 
       expect(repo.menuPosition, MenuPosition.top);
     });
+
+    testWidgets(
+        'tapping Top in mail view button position section updates the repo', (
+      tester,
+    ) async {
+      await tester.pumpWidget(
+        buildApp(
+          initialLocation: '/accounts/preferences',
+          overrides: baseOverrides(),
+        ),
+      );
+      await tester.pumpAndSettle();
+
+      await tester.tap(find.text('Top').last);
+      await tester.pumpAndSettle();
+
+      final repo = ProviderScope.containerOf(
+        tester.element(find.byType(UserPreferencesScreen)),
+      ).read(userPreferencesRepositoryProvider)
+          as FakeUserPreferencesRepository;
+
+      expect(repo.mailViewButtonPosition, MenuPosition.top);
+    });
+
+    testWidgets('shows after mail action section', (tester) async {
+      await tester.pumpWidget(
+        buildApp(
+          initialLocation: '/accounts/preferences',
+          overrides: baseOverrides(),
+        ),
+      );
+      await tester.pumpAndSettle();
+
+      // Scroll down to reveal the new section below the fold.
+      await tester.drag(find.byType(ListView), const Offset(0, -500));
+      await tester.pumpAndSettle();
+
+      expect(find.text('After mail action'), findsOneWidget);
+      expect(find.text('Next message (default)'), findsOneWidget);
+      expect(find.text('Return to mailbox'), findsOneWidget);
+    });
+
+    testWidgets('after mail action next message is selected by default', (
+      tester,
+    ) async {
+      await tester.pumpWidget(
+        buildApp(
+          initialLocation: '/accounts/preferences',
+          overrides: baseOverrides(),
+        ),
+      );
+      await tester.pumpAndSettle();
+
+      await tester.drag(find.byType(ListView), const Offset(0, -500));
+      await tester.pumpAndSettle();
+
+      final radioGroups = find.byType(RadioGroup<AfterMailViewAction>);
+      final group =
+          tester.widget<RadioGroup<AfterMailViewAction>>(radioGroups.first);
+      expect(group.groupValue, AfterMailViewAction.nextMessage);
+    });
+
+    testWidgets('tapping Return to mailbox updates the repo', (
+      tester,
+    ) async {
+      await tester.pumpWidget(
+        buildApp(
+          initialLocation: '/accounts/preferences',
+          overrides: baseOverrides(),
+        ),
+      );
+      await tester.pumpAndSettle();
+
+      await tester.drag(find.byType(ListView), const Offset(0, -500));
+      await tester.pumpAndSettle();
+
+      await tester.tap(find.text('Return to mailbox'));
+      await tester.pumpAndSettle();
+
+      final repo = ProviderScope.containerOf(
+        tester.element(find.byType(UserPreferencesScreen)),
+      ).read(userPreferencesRepositoryProvider)
+          as FakeUserPreferencesRepository;
+
+      expect(repo.afterMailViewAction, AfterMailViewAction.showMailbox);
+    });
   });
 }