SendGuard — Gmail Mis-Send Guard

Stop Gmail mis-sends—external alerts, missing attachments, empty subject, reply-all & sensitive words. Local only.

SendGuard is a Gmail-only Chrome extension that helps you prevent accidental sends and external email mistakes—without linking your Gmail account. Ideal if you mail clients, partners, or large groups and want a quiet pause before irreversible mistakes. 🔐 No Gmail API / OAuth — no account linking 🖥️ No SendGuard server — every check runs in your browser 💾 Mail content and addresses are never stored — only the settings you choose ✨ How it helps (before you click Send) 👀 Awareness while you write 🟡 External recipients — Amber compose cue when anyone in To/Cc/Bcc is outside your company domains 🏷️ Domain labels — Small internal / external tags next to recipient chips ⏸️ Pause send for common Gmail mistakes 📎 Missing attachment — Body mentions attachment words but no file or Google Drive link (quotes/signatures skipped) ✏️ Unfilled placeholders — Leftover tokens such as [Name], {{name}}, OOO, TBD 📝 Empty subject — Blank subject line before send 💬 Empty new body — Quote/signature only (easy on Reply / Reply all) 👥 Many recipients — High To+Cc+Bcc count (accidental reply-all / blast risk); threshold adjustable 🔏 Sensitive words + external — Confidential-style wording while mailing outsiders (editable word list) Send is checked on Send, Ctrl/Cmd+Enter, and Schedule send. Every pause offers “Send anyway”. Alerts appear in a SendGuard confirmation window (including when Gmail would show a native attachment confirm). 🌐 Language & settings Default attachment words, placeholders, and sensitive words follow UI language (English / Korean / Japanese). Edit chips under Settings → Words. Toggle each rule under Alerts. Theme for settings/popup: System / Light / Dark. 🛡️ Privacy 🚫 No backend / no remote mail analytics 🔐 No Gmail API / OAuth / send history ⚙️ Settings → Chrome sync; Gmail UI health probes → local only