diff --git a/components/email/email-composer.tsx b/components/email/email-composer.tsx
index 06a49912..ecbc1c87 100644
--- a/components/email/email-composer.tsx
+++ b/components/email/email-composer.tsx
@@ -103,6 +103,8 @@ export function EmailComposer({
   const timeFormat = useSettingsStore((state) => state.timeFormat);
   const plainTextMode = useSettingsStore((state) => state.plainTextMode);
   const autoSelectReplyIdentity = useSettingsStore((state) => state.autoSelectReplyIdentity);
+  const attachmentReminderEnabled = useSettingsStore((state) => state.attachmentReminderEnabled);
+  const attachmentReminderKeywords = useSettingsStore((state) => state.attachmentReminderKeywords);
 
   // Initialize with reply/forward data if provided
   const getInitialTo = () => {
@@ -212,6 +214,8 @@ export function EmailComposer({
   const [smimePassphrasePrompt, setSmimePassphrasePrompt] = useState<{ keyId: string; resolve: (passphrase: string) => void; reject: () => void } | null>(null);
   const [smimePassphraseInput, setSmimePassphraseInput] = useState('');
   const [smimePassphraseError, setSmimePassphraseError] = useState('');
+  const [showAttachmentWarning, setShowAttachmentWarning] = useState(false);
+  const [attachmentWarningKeyword, setAttachmentWarningKeyword] = useState('');
 
   const saveTemplateModalRef = useFocusTrap({
     isActive: showSaveAsTemplate,
@@ -225,6 +229,12 @@ export function EmailComposer({
     restoreFocus: true,
   });
 
+  const attachmentWarningRef = useFocusTrap({
+    isActive: showAttachmentWarning,
+    onEscape: () => setShowAttachmentWarning(false),
+    restoreFocus: true,
+  });
+
   const { client } = useAuthStore();
   const identities = useIdentityStore((s) => s.identities);
   const primaryIdentity = identities[0] ?? null;
@@ -723,7 +733,7 @@ export function EmailComposer({
     return undefined;
   };
 
-  const handleSend = async () => {
+  const handleSend = async (skipAttachmentCheck = false) => {
     const ccAddresses = cc.split(",").map(e => e.trim()).filter(Boolean);
     const bccAddresses = bcc.split(",").map(e => e.trim()).filter(Boolean);
 
@@ -742,6 +752,21 @@ export function EmailComposer({
       return;
     }
 
+    // Attachment reminder check
+    if (!skipAttachmentCheck && attachmentReminderEnabled) {
+      const hasAttachments = attachments.some(att => att.blobId && !att.uploading && !att.error);
+      if (!hasAttachments) {
+        const bodyText = htmlToPlainText(body);
+        const searchText = `${subject} ${bodyText}`.toLowerCase();
+        const matched = attachmentReminderKeywords.find(kw => searchText.includes(kw.toLowerCase()));
+        if (matched) {
+          setAttachmentWarningKeyword(matched);
+          setShowAttachmentWarning(true);
+          return;
+        }
+      }
+    }
+
     let finalDraftId = draftId;
     if (saveTimeoutRef.current) {
       clearTimeout(saveTimeoutRef.current);
@@ -1002,7 +1027,7 @@ export function EmailComposer({
         </div>
         {/* Mobile: send button in header */}
         <Button
-          onClick={handleSend}
+          onClick={() => handleSend()}
           disabled={!canSend}
           title={getSendTooltip()}
           size="sm"
@@ -1367,7 +1392,7 @@ export function EmailComposer({
               {t('discard')}
             </button>
             <Button
-              onClick={handleSend}
+              onClick={() => handleSend()}
               disabled={!canSend}
               title={getSendTooltip()}
               className="hidden md:inline-flex"
@@ -1467,6 +1492,36 @@ export function EmailComposer({
         </div>
       )}
 
+      {showAttachmentWarning && (
+        <div
+          className="fixed inset-0 bg-black/50 backdrop-blur-[1px] flex items-center justify-center z-[60] p-4 animate-in fade-in duration-150"
+          onClick={() => setShowAttachmentWarning(false)}
+        >
+          <div
+            ref={attachmentWarningRef}
+            role="alertdialog"
+            aria-modal="true"
+            onClick={(e) => e.stopPropagation()}
+            className="bg-background border border-border rounded-lg shadow-xl w-full max-w-md animate-in zoom-in-95 duration-200"
+          >
+            <div className="p-6">
+              <h2 className="text-lg font-semibold text-foreground">{t('forgot_attachment.title')}</h2>
+              <p className="mt-2 text-sm text-muted-foreground">
+                {t('forgot_attachment.message', { keyword: attachmentWarningKeyword })}
+              </p>
+            </div>
+            <div className="flex items-center justify-end gap-3 px-6 pb-6">
+              <Button variant="outline" onClick={() => setShowAttachmentWarning(false)}>
+                {t('forgot_attachment.back')}
+              </Button>
+              <Button onClick={() => { setShowAttachmentWarning(false); handleSend(true); }}>
+                {t('forgot_attachment.send_anyway')}
+              </Button>
+            </div>
+          </div>
+        </div>
+      )}
+
       {showCloseDialog && (
         <div
           className="fixed inset-0 bg-black/50 backdrop-blur-[1px] flex items-center justify-center z-[60] p-4 animate-in fade-in duration-150"
diff --git a/components/settings/email-settings.tsx b/components/settings/email-settings.tsx
index 6c8813bc..d77126b6 100644
--- a/components/settings/email-settings.tsx
+++ b/components/settings/email-settings.tsx
@@ -11,7 +11,7 @@ import { useEmailStore } from '@/stores/email-store';
 import { cn } from '@/lib/utils';
 import { RadioGroup, SettingsSection, SettingItem, Select, ToggleSwitch } from './settings-section';
 import { TrustedSendersModal } from '@/components/trusted-senders-modal';
-import { ChevronRight, AlertTriangle, FolderSync, Loader2, Mail } from 'lucide-react';
+import { ChevronRight, AlertTriangle, FolderSync, Loader2, Mail, X } from 'lucide-react';
 import { usePolicyStore } from '@/stores/policy-store';
 
 const MAIL_LAYOUT_PREVIEW_ROWS = [
@@ -110,6 +110,8 @@ export function EmailSettings() {
     }
   }, []);
 
+  const [newKeyword, setNewKeyword] = useState('');
+
   const {
     markAsReadDelay,
     deleteAction,
@@ -129,6 +131,8 @@ export function EmailSettings() {
     hoverActionsMode,
     hoverActionsCorner,
     trustedSenders,
+    attachmentReminderEnabled,
+    attachmentReminderKeywords,
     updateSetting,
   } = useSettingsStore();
 
@@ -337,6 +341,63 @@ export function EmailSettings() {
         />
       </SettingItem>
 
+      {/* Attachment Reminder */}
+      <SettingItem label={t('attachment_reminder.label')} description={t('attachment_reminder.description')}>
+        <ToggleSwitch
+          checked={attachmentReminderEnabled}
+          onChange={(checked) => updateSetting('attachmentReminderEnabled', checked)}
+        />
+      </SettingItem>
+      {attachmentReminderEnabled && (
+        <div className="py-3 border-b border-border space-y-2">
+          <div>
+            <label className="text-sm font-medium text-foreground">{t('attachment_reminder.keywords_label')}</label>
+            <p className="text-xs text-muted-foreground mt-1">{t('attachment_reminder.keywords_description')}</p>
+          </div>
+          <div className="flex flex-wrap gap-1.5">
+            {attachmentReminderKeywords.map((kw) => (
+              <span key={kw} className="inline-flex items-center gap-1 px-2 py-0.5 rounded-full text-xs bg-muted text-foreground">
+                {kw}
+                <button
+                  type="button"
+                  aria-label={t('attachment_reminder.remove')}
+                  onClick={() => updateSetting('attachmentReminderKeywords', attachmentReminderKeywords.filter(k => k !== kw))}
+                  className="text-muted-foreground hover:text-foreground"
+                >
+                  <X className="w-3 h-3" />
+                </button>
+              </span>
+            ))}
+          </div>
+          <form
+            className="flex gap-2"
+            onSubmit={(e) => {
+              e.preventDefault();
+              const trimmed = newKeyword.trim().toLowerCase();
+              if (trimmed && !attachmentReminderKeywords.includes(trimmed)) {
+                updateSetting('attachmentReminderKeywords', [...attachmentReminderKeywords, trimmed]);
+              }
+              setNewKeyword('');
+            }}
+          >
+            <input
+              type="text"
+              value={newKeyword}
+              onChange={(e) => setNewKeyword(e.target.value)}
+              placeholder={t('attachment_reminder.add_placeholder')}
+              className="flex-1 min-w-0 px-2 py-1 text-sm bg-background border border-border rounded-md focus:outline-none focus:ring-1 focus:ring-ring"
+            />
+            <button
+              type="submit"
+              disabled={!newKeyword.trim()}
+              className="px-3 py-1 text-sm bg-muted hover:bg-accent rounded-md disabled:opacity-50 disabled:cursor-not-allowed"
+            >
+              {t('attachment_reminder.add')}
+            </button>
+          </form>
+        </div>
+      )}
+
       {/* Quick Hover Actions */}
       {isFeatureEnabled('hoverActionsConfigEnabled') && (
       <div className="py-3 border-b border-border space-y-3">
diff --git a/locales/de/common.json b/locales/de/common.json
index bc6a92e6..0bce3a1a 100644
--- a/locales/de/common.json
+++ b/locales/de/common.json
@@ -494,7 +494,13 @@
     "close_draft_message": "Sie haben ungespeicherte Änderungen. Möchten Sie diese als Entwurf speichern oder verwerfen?",
     "save_draft": "Entwurf speichern",
     "drop_files": "Dateien zum Anhängen ablegen",
-    "show_less": "Weniger anzeigen"
+    "show_less": "Weniger anzeigen",
+    "forgot_attachment": {
+      "title": "Haben Sie den Anhang vergessen?",
+      "message": "Ihre Nachricht enthält \"{keyword}\", aber es ist keine Datei angehängt. Trotzdem senden?",
+      "send_anyway": "Trotzdem senden",
+      "back": "Zurück zur Bearbeitung"
+    }
   },
   "confirm_dialog": {
     "confirm": "Bestätigen",
@@ -914,6 +920,15 @@
         "button": "Als Standard festlegen",
         "success": "Browser wurde aufgefordert, als Standard festzulegen",
         "error": "Ihr Browser unterstützt diese Funktion nicht"
+      },
+      "attachment_reminder": {
+        "label": "Erinnerung an Anhang",
+        "description": "Warnung anzeigen, wenn die Nachricht Anhänge erwähnt, aber keine angehängt sind",
+        "keywords_label": "Schlüsselwörter",
+        "keywords_description": "Wörter oder Phrasen, die die Erinnerung auslösen",
+        "add_placeholder": "Schlüsselwort hinzufügen...",
+        "add": "Hinzufügen",
+        "remove": "Entfernen"
       }
     },
     "composer": {
diff --git a/locales/en/common.json b/locales/en/common.json
index 9ecc5d70..8062a10e 100644
--- a/locales/en/common.json
+++ b/locales/en/common.json
@@ -494,7 +494,13 @@
     "smime_unlock_title": "Unlock S/MIME Key",
     "smime_unlock_message": "Enter the passphrase to unlock your S/MIME signing key.",
     "smime_unlock_button": "Unlock",
-    "smime_passphrase_placeholder": "Passphrase"
+    "smime_passphrase_placeholder": "Passphrase",
+    "forgot_attachment": {
+      "title": "Did you forget an attachment?",
+      "message": "Your message mentions \"{keyword}\" but no file is attached. Send anyway?",
+      "send_anyway": "Send anyway",
+      "back": "Back to editing"
+    }
   },
   "confirm_dialog": {
     "confirm": "Confirm",
@@ -914,6 +920,15 @@
         "button": "Set as Default",
         "success": "Browser prompted to set as default",
         "error": "Your browser does not support this feature"
+      },
+      "attachment_reminder": {
+        "label": "Attachment Reminder",
+        "description": "Warn before sending when your message mentions attachments but none are attached",
+        "keywords_label": "Trigger keywords",
+        "keywords_description": "Words or phrases that trigger the reminder when found in your message",
+        "add_placeholder": "Add keyword...",
+        "add": "Add",
+        "remove": "Remove"
       }
     },
     "composer": {
diff --git a/locales/es/common.json b/locales/es/common.json
index c4aed84c..d83a17bc 100644
--- a/locales/es/common.json
+++ b/locales/es/common.json
@@ -494,7 +494,13 @@
     "close_draft_message": "Tiene cambios sin guardar. ¿Desea guardar esto como borrador o descartarlo?",
     "save_draft": "Guardar borrador",
     "drop_files": "Suelta archivos para adjuntar",
-    "show_less": "Mostrar menos"
+    "show_less": "Mostrar menos",
+    "forgot_attachment": {
+      "title": "Did you forget an attachment?",
+      "message": "Your message mentions \"{keyword}\" but no file is attached. Send anyway?",
+      "send_anyway": "Send anyway",
+      "back": "Back to editing"
+    }
   },
   "confirm_dialog": {
     "confirm": "Confirmar",
@@ -914,6 +920,15 @@
         "button": "Establecer como predeterminado",
         "success": "El navegador solicitó establecer como predeterminado",
         "error": "Su navegador no admite esta función"
+      },
+      "attachment_reminder": {
+        "label": "Attachment Reminder",
+        "description": "Warn before sending when your message mentions attachments but none are attached",
+        "keywords_label": "Trigger keywords",
+        "keywords_description": "Words or phrases that trigger the reminder when found in your message",
+        "add_placeholder": "Add keyword...",
+        "add": "Add",
+        "remove": "Remove"
       }
     },
     "composer": {
diff --git a/locales/fr/common.json b/locales/fr/common.json
index a2f7da9a..855f4976 100644
--- a/locales/fr/common.json
+++ b/locales/fr/common.json
@@ -494,7 +494,13 @@
     "close_draft_message": "Vous avez des modifications non enregistrées. Voulez-vous enregistrer comme brouillon ou supprimer ?",
     "save_draft": "Enregistrer le brouillon",
     "drop_files": "Déposez les fichiers à joindre",
-    "show_less": "Afficher moins"
+    "show_less": "Afficher moins",
+    "forgot_attachment": {
+      "title": "Did you forget an attachment?",
+      "message": "Your message mentions \"{keyword}\" but no file is attached. Send anyway?",
+      "send_anyway": "Send anyway",
+      "back": "Back to editing"
+    }
   },
   "confirm_dialog": {
     "confirm": "Confirmer",
@@ -914,6 +920,15 @@
         "button": "Définir par défaut",
         "success": "Le navigateur a été invité à définir par défaut",
         "error": "Votre navigateur ne prend pas en charge cette fonctionnalité"
+      },
+      "attachment_reminder": {
+        "label": "Attachment Reminder",
+        "description": "Warn before sending when your message mentions attachments but none are attached",
+        "keywords_label": "Trigger keywords",
+        "keywords_description": "Words or phrases that trigger the reminder when found in your message",
+        "add_placeholder": "Add keyword...",
+        "add": "Add",
+        "remove": "Remove"
       }
     },
     "composer": {
diff --git a/locales/it/common.json b/locales/it/common.json
index 714b98ea..e48c2294 100644
--- a/locales/it/common.json
+++ b/locales/it/common.json
@@ -494,7 +494,13 @@
     "close_draft_message": "Hai modifiche non salvate. Vuoi salvare come bozza o eliminare?",
     "save_draft": "Salva bozza",
     "drop_files": "Trascina i file per allegarli",
-    "show_less": "Mostra meno"
+    "show_less": "Mostra meno",
+    "forgot_attachment": {
+      "title": "Did you forget an attachment?",
+      "message": "Your message mentions \"{keyword}\" but no file is attached. Send anyway?",
+      "send_anyway": "Send anyway",
+      "back": "Back to editing"
+    }
   },
   "confirm_dialog": {
     "confirm": "Conferma",
@@ -914,6 +920,15 @@
         "button": "Imposta come predefinito",
         "success": "Il browser ha chiesto di impostare come predefinito",
         "error": "Il tuo browser non supporta questa funzionalità"
+      },
+      "attachment_reminder": {
+        "label": "Attachment Reminder",
+        "description": "Warn before sending when your message mentions attachments but none are attached",
+        "keywords_label": "Trigger keywords",
+        "keywords_description": "Words or phrases that trigger the reminder when found in your message",
+        "add_placeholder": "Add keyword...",
+        "add": "Add",
+        "remove": "Remove"
       }
     },
     "composer": {
diff --git a/locales/ja/common.json b/locales/ja/common.json
index 32ec986c..fc40cc62 100644
--- a/locales/ja/common.json
+++ b/locales/ja/common.json
@@ -494,7 +494,13 @@
     "close_draft_message": "未保存の変更があります。下書きとして保存しますか、それとも破棄しますか？",
     "save_draft": "下書きを保存",
     "drop_files": "ファイルをドロップして添付",
-    "show_less": "折りたたむ"
+    "show_less": "折りたたむ",
+    "forgot_attachment": {
+      "title": "Did you forget an attachment?",
+      "message": "Your message mentions \"{keyword}\" but no file is attached. Send anyway?",
+      "send_anyway": "Send anyway",
+      "back": "Back to editing"
+    }
   },
   "confirm_dialog": {
     "confirm": "確認",
@@ -914,6 +920,15 @@
         "button": "既定に設定",
         "success": "ブラウザに既定として設定するよう要求しました",
         "error": "お使いのブラウザはこの機能をサポートしていません"
+      },
+      "attachment_reminder": {
+        "label": "Attachment Reminder",
+        "description": "Warn before sending when your message mentions attachments but none are attached",
+        "keywords_label": "Trigger keywords",
+        "keywords_description": "Words or phrases that trigger the reminder when found in your message",
+        "add_placeholder": "Add keyword...",
+        "add": "Add",
+        "remove": "Remove"
       }
     },
     "composer": {
diff --git a/locales/ko/common.json b/locales/ko/common.json
index cad0abd5..f64ed071 100644
--- a/locales/ko/common.json
+++ b/locales/ko/common.json
@@ -494,7 +494,13 @@
     "smime_unlock_title": "S/MIME 키 잠금 해제",
     "smime_unlock_message": "S/MIME 서명 키의 잠금을 해제하려면 비밀번호를 입력해 주세요.",
     "smime_unlock_button": "잠금 해제",
-    "smime_passphrase_placeholder": "비밀번호"
+    "smime_passphrase_placeholder": "비밀번호",
+    "forgot_attachment": {
+      "title": "Did you forget an attachment?",
+      "message": "Your message mentions \"{keyword}\" but no file is attached. Send anyway?",
+      "send_anyway": "Send anyway",
+      "back": "Back to editing"
+    }
   },
   "confirm_dialog": {
     "confirm": "확인",
@@ -914,6 +920,15 @@
         "button": "기본값으로 설정",
         "success": "브라우저에서 기본 설정 팝업이 뜰 거예요",
         "error": "이 브라우저에서는 이 기능을 지원하지 않아요"
+      },
+      "attachment_reminder": {
+        "label": "Attachment Reminder",
+        "description": "Warn before sending when your message mentions attachments but none are attached",
+        "keywords_label": "Trigger keywords",
+        "keywords_description": "Words or phrases that trigger the reminder when found in your message",
+        "add_placeholder": "Add keyword...",
+        "add": "Add",
+        "remove": "Remove"
       }
     },
     "composer": {
diff --git a/locales/lv/common.json b/locales/lv/common.json
index ea3a22b7..448cfab7 100644
--- a/locales/lv/common.json
+++ b/locales/lv/common.json
@@ -493,7 +493,13 @@
     "smime_unlock_title": "Atbloķēt S/MIME atslēgu",
     "smime_unlock_message": "Ievadiet paroli, lai atbloķētu savu S/MIME parakstīšanas atslēgu.",
     "smime_unlock_button": "Atbloķēt",
-    "smime_passphrase_placeholder": "Parole"
+    "smime_passphrase_placeholder": "Parole",
+    "forgot_attachment": {
+      "title": "Did you forget an attachment?",
+      "message": "Your message mentions \"{keyword}\" but no file is attached. Send anyway?",
+      "send_anyway": "Send anyway",
+      "back": "Back to editing"
+    }
   },
   "confirm_dialog": {
     "confirm": "Apstiprināt",
@@ -913,6 +919,15 @@
         "button": "Iestatīt kā noklusējumu",
         "success": "Pārlūkam nosūtīts pieprasījums iestatīt kā noklusējumu",
         "error": "Jūsu pārlūks neatbalsta šo funkciju"
+      },
+      "attachment_reminder": {
+        "label": "Attachment Reminder",
+        "description": "Warn before sending when your message mentions attachments but none are attached",
+        "keywords_label": "Trigger keywords",
+        "keywords_description": "Words or phrases that trigger the reminder when found in your message",
+        "add_placeholder": "Add keyword...",
+        "add": "Add",
+        "remove": "Remove"
       }
     },
     "composer": {
diff --git a/locales/nl/common.json b/locales/nl/common.json
index e180b8f1..685b19fa 100644
--- a/locales/nl/common.json
+++ b/locales/nl/common.json
@@ -494,7 +494,13 @@
     "close_draft_message": "U heeft niet-opgeslagen wijzigingen. Wilt u dit als concept opslaan of verwijderen?",
     "save_draft": "Concept opslaan",
     "drop_files": "Sleep bestanden om bij te voegen",
-    "show_less": "Minder tonen"
+    "show_less": "Minder tonen",
+    "forgot_attachment": {
+      "title": "Did you forget an attachment?",
+      "message": "Your message mentions \"{keyword}\" but no file is attached. Send anyway?",
+      "send_anyway": "Send anyway",
+      "back": "Back to editing"
+    }
   },
   "confirm_dialog": {
     "confirm": "Bevestigen",
@@ -914,6 +920,15 @@
         "button": "Instellen als standaard",
         "success": "Browser gevraagd om als standaard in te stellen",
         "error": "Uw browser ondersteunt deze functie niet"
+      },
+      "attachment_reminder": {
+        "label": "Attachment Reminder",
+        "description": "Warn before sending when your message mentions attachments but none are attached",
+        "keywords_label": "Trigger keywords",
+        "keywords_description": "Words or phrases that trigger the reminder when found in your message",
+        "add_placeholder": "Add keyword...",
+        "add": "Add",
+        "remove": "Remove"
       }
     },
     "composer": {
diff --git a/locales/pl/common.json b/locales/pl/common.json
index 3b64203f..ed1fb15a 100644
--- a/locales/pl/common.json
+++ b/locales/pl/common.json
@@ -494,7 +494,13 @@
     "smime_unlock_title": "Odblokuj klucz S/MIME",
     "smime_unlock_message": "Wprowadź hasło, aby odblokować klucz podpisywania S/MIME.",
     "smime_unlock_button": "Odblokuj",
-    "smime_passphrase_placeholder": "Hasło"
+    "smime_passphrase_placeholder": "Hasło",
+    "forgot_attachment": {
+      "title": "Did you forget an attachment?",
+      "message": "Your message mentions \"{keyword}\" but no file is attached. Send anyway?",
+      "send_anyway": "Send anyway",
+      "back": "Back to editing"
+    }
   },
   "confirm_dialog": {
     "confirm": "Potwierdź",
@@ -916,6 +922,15 @@
         "button": "Ustaw jako domyślny",
         "success": "Przeglądarka poprosiła o ustawienie jako domyślnego",
         "error": "Twoja przeglądarka nie obsługuje tej funkcji"
+      },
+      "attachment_reminder": {
+        "label": "Attachment Reminder",
+        "description": "Warn before sending when your message mentions attachments but none are attached",
+        "keywords_label": "Trigger keywords",
+        "keywords_description": "Words or phrases that trigger the reminder when found in your message",
+        "add_placeholder": "Add keyword...",
+        "add": "Add",
+        "remove": "Remove"
       }
     },
     "composer": {
diff --git a/locales/pt/common.json b/locales/pt/common.json
index aa006639..468980a1 100644
--- a/locales/pt/common.json
+++ b/locales/pt/common.json
@@ -494,7 +494,13 @@
     "close_draft_message": "Você tem alterações não salvas. Deseja salvar como rascunho ou descartar?",
     "save_draft": "Salvar rascunho",
     "drop_files": "Solte arquivos para anexar",
-    "show_less": "Mostrar menos"
+    "show_less": "Mostrar menos",
+    "forgot_attachment": {
+      "title": "Did you forget an attachment?",
+      "message": "Your message mentions \"{keyword}\" but no file is attached. Send anyway?",
+      "send_anyway": "Send anyway",
+      "back": "Back to editing"
+    }
   },
   "confirm_dialog": {
     "confirm": "Confirmar",
@@ -914,6 +920,15 @@
         "button": "Definir como padrão",
         "success": "O navegador solicitou definir como padrão",
         "error": "Seu navegador não suporta esta funcionalidade"
+      },
+      "attachment_reminder": {
+        "label": "Attachment Reminder",
+        "description": "Warn before sending when your message mentions attachments but none are attached",
+        "keywords_label": "Trigger keywords",
+        "keywords_description": "Words or phrases that trigger the reminder when found in your message",
+        "add_placeholder": "Add keyword...",
+        "add": "Add",
+        "remove": "Remove"
       }
     },
     "composer": {
diff --git a/locales/ru/common.json b/locales/ru/common.json
index 34e082e8..fd705832 100644
--- a/locales/ru/common.json
+++ b/locales/ru/common.json
@@ -494,7 +494,13 @@
     "smime_unlock_title": "Разблокировать ключ S/MIME",
     "smime_unlock_message": "Введите парольную фразу для разблокировки вашего ключа подписи S/MIME.",
     "smime_unlock_button": "Разблокировать",
-    "smime_passphrase_placeholder": "Парольная фраза"
+    "smime_passphrase_placeholder": "Парольная фраза",
+    "forgot_attachment": {
+      "title": "Did you forget an attachment?",
+      "message": "Your message mentions \"{keyword}\" but no file is attached. Send anyway?",
+      "send_anyway": "Send anyway",
+      "back": "Back to editing"
+    }
   },
   "confirm_dialog": {
     "confirm": "Подтвердить",
@@ -914,6 +920,15 @@
         "button": "Установить по умолчанию",
         "success": "Браузер запрошен для установки по умолчанию",
         "error": "Ваш браузер не поддерживает эту функцию"
+      },
+      "attachment_reminder": {
+        "label": "Attachment Reminder",
+        "description": "Warn before sending when your message mentions attachments but none are attached",
+        "keywords_label": "Trigger keywords",
+        "keywords_description": "Words or phrases that trigger the reminder when found in your message",
+        "add_placeholder": "Add keyword...",
+        "add": "Add",
+        "remove": "Remove"
       }
     },
     "composer": {
diff --git a/locales/zh/common.json b/locales/zh/common.json
index 2fd33cef..48a47efb 100644
--- a/locales/zh/common.json
+++ b/locales/zh/common.json
@@ -494,7 +494,13 @@
     "smime_unlock_title": "解锁 S/MIME 密钥",
     "smime_unlock_message": "输入密码以解锁您的 S/MIME 签名密钥。",
     "smime_unlock_button": "解锁",
-    "smime_passphrase_placeholder": "输入密码"
+    "smime_passphrase_placeholder": "输入密码",
+    "forgot_attachment": {
+      "title": "Did you forget an attachment?",
+      "message": "Your message mentions \"{keyword}\" but no file is attached. Send anyway?",
+      "send_anyway": "Send anyway",
+      "back": "Back to editing"
+    }
   },
   "confirm_dialog": {
     "confirm": "确认",
@@ -914,6 +920,15 @@
         "button": "设为默认",
         "success": "浏览器已提示设置为默认",
         "error": "您的浏览器不支持此功能"
+      },
+      "attachment_reminder": {
+        "label": "Attachment Reminder",
+        "description": "Warn before sending when your message mentions attachments but none are attached",
+        "keywords_label": "Trigger keywords",
+        "keywords_description": "Words or phrases that trigger the reminder when found in your message",
+        "add_placeholder": "Add keyword...",
+        "add": "Add",
+        "remove": "Remove"
       }
     },
     "composer": {
diff --git a/stores/settings-store.ts b/stores/settings-store.ts
index e500a0a0..870d9fab 100644
--- a/stores/settings-store.ts
+++ b/stores/settings-store.ts
@@ -185,6 +185,10 @@ interface SettingsState {
   // Keywords (labels/tags)
   emailKeywords: KeywordDefinition[];
 
+  // Attachment Reminder
+  attachmentReminderEnabled: boolean;
+  attachmentReminderKeywords: string[];
+
   // Sidebar Apps
   sidebarApps: SidebarApp[];
   keepAppsLoaded: boolean;
@@ -314,6 +318,37 @@ const DEFAULT_SETTINGS = {
   // Keywords
   emailKeywords: DEFAULT_KEYWORDS,
 
+  // Attachment Reminder
+  attachmentReminderEnabled: true,
+  attachmentReminderKeywords: [
+    // English
+    'attached', 'attachment', 'attachments', 'see attached', 'find attached', 'please find attached',
+    // German
+    'angehängt', 'anhang', 'anbei', 'im anhang',
+    // French
+    'ci-joint', 'pièce jointe',
+    // Spanish
+    'adjunto', 'adjunta', 'en adjunto',
+    // Italian
+    'allegato', 'in allegato',
+    // Dutch
+    'bijgevoegd', 'bijlage',
+    // Portuguese
+    'em anexo', 'anexo',
+    // Polish
+    'w załączniku',
+    // Russian
+    'во вложении',
+    // Japanese
+    '添付',
+    // Chinese
+    '附件',
+    // Korean
+    '첨부',
+    // Latvian
+    'pielikumā',
+  ] as string[],
+
   // Sidebar Apps
   sidebarApps: [] as SidebarApp[],
   keepAppsLoaded: false,
@@ -412,6 +447,8 @@ export const useSettingsStore = create<SettingsState>()(
           senderFavicons: state.senderFavicons,
           folderIcons: state.folderIcons,
           emailKeywords: state.emailKeywords,
+          attachmentReminderEnabled: state.attachmentReminderEnabled,
+          attachmentReminderKeywords: state.attachmentReminderKeywords,
           sidebarApps: state.sidebarApps,
           keepAppsLoaded: state.keepAppsLoaded,
           debugMode: state.debugMode,