The Bridge app for Linux enables you to integrate your ProtonMail account with IMAP and SMTP email programs such as Thunderbird and Evolution. Bridge is available to all ProtonMail users with a paid subscription.
The app is available for DEB, RPM and PKGBUILD distributions, covering most derivatives. (debian and all derivatives like Ubuntu, Mint; RedHat and derivatives like Centos, Fedora; Arch and derivatives like Manjaro)
You can download the app on Bridge homepage.
Note: To log in with your ProtonMail account, you need Gnome keyring or Pass installed on your device.
Follow our instructions to configure your account with Thunderbird.