Proton Mail Bridge

Proton Mail Bridge adds end-to-end encryption to popular e-mail apps, including Outlook, Thunderbird, and Apple Mail.

The app seamlessly encrypts your e-mails so that only you and your intended recipient can access them. To protect your data, Proton Mail Bridge uses a unique password that is different from your login password and never leaves your computer.

Proton Mail Bridge is a desktop application that runs in the background, encrypting and decrypting messages as they enter and leave your computer. It lets you add your Proton Mail account to your favorite e-mail client via IMAP/SMTP by creating a local e-mail server on your computer.