diff --git a/crates/tranquil-api/src/notification_prefs.rs b/crates/tranquil-api/src/notification_prefs.rs
index dec6d39..d7cc7a8 100644
--- a/crates/tranquil-api/src/notification_prefs.rs
+++ b/crates/tranquil-api/src/notification_prefs.rs
@@ -19,6 +19,7 @@ pub struct NotificationPrefsOutput {
     pub telegram_verified: bool,
     pub signal_username: Option<String>,
     pub signal_verified: bool,
+    pub legacy_login_alerts: bool,
 }
 
 pub async fn get_notification_prefs(
@@ -32,6 +33,26 @@ pub async fn get_notification_prefs(
         .await
         .log_db_err("get notification prefs")?
         .ok_or(ApiError::AccountNotFound)?;
+
+    let user_id = state
+        .repos
+        .user
+        .get_id_by_did(&auth.did)
+        .await
+        .log_db_err("get user by did")?
+        .ok_or(ApiError::AccountNotFound)?;
+
+    let legacy_login_alerts = state
+        .repos
+        .infra
+        .get_account_preferences(user_id)
+        .await
+        .log_db_err("get legacy login alert prefs")?
+        .iter()
+        .find(|(name, _)| name == "legacy_login_alerts")
+        .and_then(|(_, value)| value.as_bool())
+        .unwrap_or(true);
+
     Ok(Json(NotificationPrefsOutput {
         preferred_channel: prefs.preferred_channel,
         email: prefs.email,
@@ -41,6 +62,7 @@ pub async fn get_notification_prefs(
         telegram_verified: prefs.telegram_verified,
         signal_username: prefs.signal_username,
         signal_verified: prefs.signal_verified,
+        legacy_login_alerts,
     }))
 }
 
@@ -121,6 +143,7 @@ pub struct UpdateNotificationPrefsInput {
     pub discord_username: Option<String>,
     pub telegram_username: Option<String>,
     pub signal_username: Option<String>,
+    pub legacy_login_alerts: Option<bool>,
 }
 
 #[derive(Serialize)]
@@ -435,6 +458,15 @@ pub async fn update_notification_prefs(
         .await?;
     }
 
+    if let Some(alerts) = input.legacy_login_alerts {
+        state
+            .repos
+            .infra
+            .upsert_account_preference(user_id, "legacy_login_alerts", json!(alerts))
+            .await
+            .log_db_err("update legacy login alert prefs")?;
+    }
+
     Ok(Json(UpdateNotificationPrefsOutput {
         success: true,
         verification_required,
diff --git a/crates/tranquil-api/src/server/session.rs b/crates/tranquil-api/src/server/session.rs
index 4cc2d40..5074cef 100644
--- a/crates/tranquil-api/src/server/session.rs
+++ b/crates/tranquil-api/src/server/session.rs
@@ -323,15 +323,31 @@ pub async fn create_session(
             "Legacy login on TOTP-enabled account - sending notification"
         );
         let hostname = &tranquil_config::get().server.hostname;
-        if let Err(e) = tranquil_pds::comms::comms_repo::enqueue_legacy_login(
-            state.repos.user.as_ref(),
-            state.repos.infra.as_ref(),
-            row.id,
-            hostname,
-            client_ip,
-            row.preferred_comms_channel,
-        )
-        .await
+
+        let alerts_enabled = state
+            .repos
+            .infra
+            .get_account_preferences(row.id)
+            .await
+            .map(|prefs| {
+                prefs
+                    .iter()
+                    .find(|(name, _)| name == "legacy_login_alerts")
+                    .and_then(|(_, value)| value.as_bool())
+                    .unwrap_or(true)
+            })
+            .unwrap_or(true);
+
+        if alerts_enabled
+            && let Err(e) = tranquil_pds::comms::comms_repo::enqueue_legacy_login(
+                state.repos.user.as_ref(),
+                state.repos.infra.as_ref(),
+                row.id,
+                hostname,
+                client_ip,
+                row.preferred_comms_channel,
+            )
+            .await
         {
             error!("Failed to queue legacy login notification: {:?}", e);
         }
diff --git a/frontend/src/components/dashboard/CommsContent.svelte b/frontend/src/components/dashboard/CommsContent.svelte
index f287364..95d11a4 100644
--- a/frontend/src/components/dashboard/CommsContent.svelte
+++ b/frontend/src/components/dashboard/CommsContent.svelte
@@ -30,6 +30,7 @@
   let savedDiscordUsername = $state('')
   let savedTelegramUsername = $state('')
   let savedSignalUsername = $state('')
+  let legacyLoginAlerts = $state(true)
   let verifyingChannel = $state<string | null>(null)
   let verificationCode = $state('')
   let historyLoading = $state(true)
@@ -62,6 +63,7 @@
       telegramVerified = prefs.telegramVerified
       signalUsername = prefs.signalUsername ?? ''
       signalVerified = prefs.signalVerified
+      legacyLoginAlerts = prefs.legacyLoginAlerts ?? true
       savedDiscordUsername = discordUsername
       savedTelegramUsername = telegramUsername
       savedSignalUsername = signalUsername
@@ -85,6 +87,7 @@
         discordUsername: discordUsername !== savedDiscordUsername ? discordUsername : undefined,
         telegramUsername: telegramUsername !== savedTelegramUsername ? telegramUsername : undefined,
         signalUsername: signalUsername !== savedSignalUsername ? signalUsername : undefined,
+        legacyLoginAlerts,
       })
       await refreshSession()
       toast.success($_('comms.preferencesSaved'))
@@ -316,6 +319,25 @@
         </div>
       </section>
 
+      <section>
+        <h3>{$_('comms.securityAlerts')}</h3>
+        <div class="toggle-row">
+          <div class="toggle-info">
+            <span class="toggle-label">{$_('comms.legacyLoginAlerts')}</span>
+            <span class="toggle-description">{$_('comms.legacyLoginAlertsDescription')}</span>
+          </div>
+          <button
+            type="button"
+            class="toggle-button {legacyLoginAlerts ? 'on' : 'off'}"
+            onclick={() => legacyLoginAlerts = !legacyLoginAlerts}
+            disabled={saving}
+            aria-label={legacyLoginAlerts ? $_('comms.disableLegacyLoginAlerts') : $_('comms.enableLegacyLoginAlerts')}
+          >
+            <span class="toggle-slider"></span>
+          </button>
+        </div>
+      </section>
+
       <div class="actions">
         <button type="submit" disabled={saving}>
           {saving ? $_('common.saving') : $_('comms.savePreferences')}
diff --git a/frontend/src/lib/api.ts b/frontend/src/lib/api.ts
index 6ef4eb9..1f93a49 100644
--- a/frontend/src/lib/api.ts
+++ b/frontend/src/lib/api.ts
@@ -680,6 +680,7 @@ export const api = {
     discordUsername?: string;
     telegramUsername?: string;
     signalUsername?: string;
+    legacyLoginAlerts?: boolean;
   }): Promise<UpdateNotificationPrefsResponse> {
     return xrpc("_account.updateNotificationPrefs", {
       method: "POST",
diff --git a/frontend/src/lib/types/api.ts b/frontend/src/lib/types/api.ts
index 103394a..47a2ef6 100644
--- a/frontend/src/lib/types/api.ts
+++ b/frontend/src/lib/types/api.ts
@@ -232,6 +232,7 @@ export interface NotificationPrefs {
   telegramVerified: boolean;
   signalUsername: string | null;
   signalVerified: boolean;
+  legacyLoginAlerts: boolean;
 }
 
 export interface NotificationHistoryItem {
diff --git a/frontend/src/locales/en.json b/frontend/src/locales/en.json
index ff4ff60..3f2d63e 100644
--- a/frontend/src/locales/en.json
+++ b/frontend/src/locales/en.json
@@ -458,7 +458,12 @@
     "telegramStartBot": "Or send /start {handle} to @{botUsername} manually",
     "telegramOpenLink": "Open Telegram to verify",
     "discordStartBot": "DM @{botUsername} on Discord and send /start {handle}",
-    "discordOpenLink": "Open Discord to verify"
+    "discordOpenLink": "Open Discord to verify",
+    "securityAlerts": "Security alerts",
+    "legacyLoginAlerts": "Legacy login alerts",
+    "legacyLoginAlertsDescription": "Get notified when someone signs in to your TOTP enabled account without using legacy login methods.",
+    "enableLegacyLoginAlerts": "Enable legacy login alerts",
+    "disableLegacyLoginAlerts": "Disable legacy login alerts"
   },
   "repoExplorer": {
     "collections": "Collections",
diff --git a/frontend/src/locales/fi.json b/frontend/src/locales/fi.json
index e8cbbf5..dbe7d5d 100644
--- a/frontend/src/locales/fi.json
+++ b/frontend/src/locales/fi.json
@@ -458,7 +458,12 @@
     "failedToLoad": "Asetusten lataus epäonnistui",
     "failedToSave": "Asetusten tallennus epäonnistui",
     "failedToVerify": "Vahvistus epäonnistui",
-    "failedToLoadHistory": "Viestihistorian lataus epäonnistui"
+    "failedToLoadHistory": "Viestihistorian lataus epäonnistui",
+    "securityAlerts": "Turvallisuushälytykset",
+    "legacyLoginAlerts": "Vanhat kirjautumisilmoitukset",
+    "legacyLoginAlertsDescription": "Saat ilmoituksen, kun joku kirjautuu TOTP-yhteensopivalle tilillesi käyttämällä vanhoja kirjautumistapoja.",
+    "enableLegacyLoginAlerts": "Ota käyttöön vanhat kirjautumisilmoitukset",
+    "disableLegacyLoginAlerts": "Poista käytöstä vanhat kirjautumisilmoitukset"
   },
   "repoExplorer": {
     "collections": "Kokoelmat",
diff --git a/frontend/src/locales/fr.json b/frontend/src/locales/fr.json
index 8a7ce1b..7297b7f 100644
--- a/frontend/src/locales/fr.json
+++ b/frontend/src/locales/fr.json
@@ -458,7 +458,12 @@
     "telegramStartBot": "Ou envoyez /start {handle} à @{botUsername} manuellement",
     "telegramOpenLink": "Ouvrir Telegram pour vérifier",
     "discordStartBot": "Envoyez un DM à @{botUsername} sur Discord avec /start {handle}",
-    "discordOpenLink": "Ouvrir Discord pour vérifier"
+    "discordOpenLink": "Ouvrir Discord pour vérifier",
+    "securityAlerts": "Alertes de sécurité",
+    "legacyLoginAlerts": "Anciennes alertes de connexion",
+    "legacyLoginAlertsDescription": "Recevez une notification lorsque quelqu'un se connecte à votre compte TOTP à l'aide de méthodes de connexion héritées.",
+    "enableLegacyLoginAlerts": "Activer les alertes de connexion héritées",
+    "disableLegacyLoginAlerts": "Désactiver les alertes de connexion héritées"
   },
   "repoExplorer": {
     "collections": "Collections",
diff --git a/frontend/src/locales/ja.json b/frontend/src/locales/ja.json
index c136074..bd2ea01 100644
--- a/frontend/src/locales/ja.json
+++ b/frontend/src/locales/ja.json
@@ -458,7 +458,12 @@
     "failedToLoad": "設定の読み込みに失敗しました",
     "failedToSave": "設定の保存に失敗しました",
     "failedToVerify": "確認に失敗しました",
-    "failedToLoadHistory": "メッセージ履歴の読み込みに失敗しました"
+    "failedToLoadHistory": "メッセージ履歴の読み込みに失敗しました",
+    "securityAlerts": "セキュリティ警告",
+    "legacyLoginAlerts": "レガシーログインアラート",
+    "legacyLoginAlertsDescription": "誰かが従来のログイン方法を使用してTOTP対応アカウントにサインインしたときに通知を受け取ります。",
+    "enableLegacyLoginAlerts": "レガシーログインアラートを有効にする",
+    "disableLegacyLoginAlerts": "レガシーログインアラートを無効にする"
   },
   "repoExplorer": {
     "collections": "コレクション",
diff --git a/frontend/src/locales/ko.json b/frontend/src/locales/ko.json
index dc7d211..31d55b1 100644
--- a/frontend/src/locales/ko.json
+++ b/frontend/src/locales/ko.json
@@ -458,7 +458,12 @@
     "failedToLoad": "설정 로딩 실패",
     "failedToSave": "설정 저장 실패",
     "failedToVerify": "인증 실패",
-    "failedToLoadHistory": "메시지 기록 로딩 실패"
+    "failedToLoadHistory": "메시지 기록 로딩 실패",
+    "securityAlerts": "보안 경고",
+    "legacyLoginAlerts": "레거시 로그인 알림",
+    "legacyLoginAlertsDescription": "레거시 로그인 방법을 사용하여 누군가가 TOTP 지원 계정에 로그인하면 알림을 받습니다.",
+    "enableLegacyLoginAlerts": "레거시 로그인 알림 활성화",
+    "disableLegacyLoginAlerts": "레거시 로그인 알림 비활성화"
   },
   "repoExplorer": {
     "collections": "컬렉션",
diff --git a/frontend/src/locales/sv.json b/frontend/src/locales/sv.json
index 3cb6cc3..f2d15e9 100644
--- a/frontend/src/locales/sv.json
+++ b/frontend/src/locales/sv.json
@@ -458,7 +458,12 @@
     "failedToLoad": "Kunde inte ladda inställningar",
     "failedToSave": "Kunde inte spara inställningar",
     "failedToVerify": "Verifiering misslyckades",
-    "failedToLoadHistory": "Kunde inte ladda meddelandehistorik"
+    "failedToLoadHistory": "Kunde inte ladda meddelandehistorik",
+    "securityAlerts": "Säkerhetsvarningar",
+    "legacyLoginAlerts": "Varningar för föråldrade inloggningsmetoder",
+    "legacyLoginAlertsDescription": "Bli notifierad när en inloggning sker med föråldrade inloggningsmetoder, när du har TOTP aktiverat.",
+    "enableLegacyLoginAlerts": "Aktivera föråldrad inloggningsmetodsvarning",
+    "disableLegacyLoginAlerts": "Avaktivera föråldrad inloggningsmetodsvarning"
   },
   "repoExplorer": {
     "collections": "Samlingar",
diff --git a/frontend/src/locales/zh.json b/frontend/src/locales/zh.json
index 3750c70..00d13b3 100644
--- a/frontend/src/locales/zh.json
+++ b/frontend/src/locales/zh.json
@@ -458,7 +458,12 @@
     "failedToLoad": "加载偏好设置失败",
     "failedToSave": "保存偏好设置失败",
     "failedToVerify": "验证失败",
-    "failedToLoadHistory": "加载消息历史失败"
+    "failedToLoadHistory": "加载消息历史失败",
+    "securityAlerts": "安全警报",
+    "legacyLoginAlerts": "旧版登录提醒",
+    "legacyLoginAlertsDescription": "当有人使用传统登录方式登录您的启用了TOTP的帐户时，会收到通知。",
+    "enableLegacyLoginAlerts": "启用旧版登录警报",
+    "disableLegacyLoginAlerts": "禁用旧版登录警报"
   },
   "repoExplorer": {
     "collections": "集合",
diff --git a/frontend/src/tests/mocks.ts b/frontend/src/tests/mocks.ts
index e46af7c..50b794d 100644
--- a/frontend/src/tests/mocks.ts
+++ b/frontend/src/tests/mocks.ts
@@ -260,6 +260,7 @@ export const mockData = {
     telegramVerified: false,
     signalUsername: null,
     signalVerified: false,
+    legacyLoginAlerts: true,
     ...overrides,
   }),
   describeServer: (overrides?: Record<string, unknown>) => ({