Free, open-source email app for Windows. Unlimited accounts. No subscription, no tracking.
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Free, open-source Windows email client with unlimited accounts
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Read the full README ↗A free, open-source email client for Windows. Add as many accounts as you like. No limits, no ads, no subscription.
Website: https://voydapps.github.io/letterdock/
Made by voyd.
.eml files (Letterdock appears in Windows Default apps for .eml; it never makes itself the default)mailto: links when you choose it as your default mail app| Replies grouped into conversations | Write now, send later |
| Rules sort your mail for you | Pictures are blocked until you allow them |
| Bright emails in dark mode | Add as many accounts as you like |
Website: https://voydapps.github.io/letterdock/
All pictures use made-up people and mail. Regenerate them with npm run site:screenshots.
Get the latest installer from the Releases page. Download Letterdock-Setup-<version>.exe and run it.
The installer is not code-signed yet. Windows SmartScreen may show "Windows protected your PC". This is expected. Click More info, then Run anyway.
Gmail does not accept your normal password in desktop mail apps. Use an app password instead:
"Sign in with Microsoft" needs an app registration (client ID). It is coming. Until then, other IMAP accounts work as usual.
You need Node.js 24 (see .nvmrc) and Windows.
npm ci
npm run dev # start the app with hot reload
npm run typecheck
npm run lint
npm test
npm run dist # build the installer into release/
Local installer builds can be blocked by Windows Smart App Control. The official installers are built by GitHub Actions: bump the version in package.json, commit, then push a tag like v0.2.6. The installer appears on the Releases page.
Set LETTERDOCK_DATA_DIR to run with a throwaway data folder. Set LETTERDOCK_MS_CLIENT_ID to test "Sign in with Microsoft" with your own app registration.
Letterdock has no telemetry and no analytics, and no Letterdock servers. Your mail, accounts and settings stay on your PC (in %APPDATA%\Letterdock). Passwords are kept in Windows protected storage (DPAPI). The app talks to your own mail servers, to GitHub (to check for updates), to your email domain and Thunderbird's public settings list (to find server settings when you add an account), and to image servers only after you allow pictures.
MIT (c) 2026 voyd