# Proton Mail Bridge

> Proton Mail Bridge is a self-hosted open-source desktop app that lets you use Proton Mail encryption with Outlook, Thunderbird, and Apple Mail via local IMAP/SMTP.

- **Category:** Communication
- **Licence:** GPL-3.0
- **Latest version:** v3.27.1
- **Open source:** oss
- **Languages:** Gherkin, Go, C++
- **Platforms:** Linux, Windows, macOS, Build from Source
- **Tags:** Privacy, Email, Security, Encryption, IMAP, End To End Encryption, Pgp, SMTP, Desktop, Bridge, Proton Mail

## Description

This desktop application from Proton AG brings end-to-end encrypted email to standard email clients. It runs locally on Windows, macOS, or Linux and creates IMAP and SMTP servers that handle encryption transparently. Compatible clients include Microsoft Outlook, Mozilla Thunderbird, and Apple Mail. The software requires a paid Proton Mail subscription and a supported keychain for credential storage. On Linux this means GNOME Keyring or pass; Windows and macOS use their native credential managers. Official packages are provided as DEB, RPM, and PKGBUILD for Ubuntu LTS and Fedora Workstation. The code is licensed under GPL-3.0 and includes automatic updates verified by a launcher that checks binary signatures.

## Links

- [Homepage](https://github.com/protonmail/proton-bridge)
- [Website](https://proton.me/mail/bridge)
- [Documentation](https://proton.me/support/mail/bridge)
- [System requirements](https://proton.me/support/operating-systems-supported-bridge)
- [Installation guide](https://proton.me/support/protonmail-bridge-install)
- [IMAP/SMTP/POP3 setup](https://proton.me/support/imap-smtp-and-pop3-setup)
- [GitHub repository](https://github.com/ProtonMail/proton-bridge)
- [Security model article](https://proton.me/blog/bridge-security-model)
- [UserVoice feature requests](https://protonmail.uservoice.com/)
- [Reddit community](https://reddit.com/r/ProtonMail/)
- [Discord](https://discord.gg/proton)

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Source: https://selfhost.directory/project/proton-bridge