ProtonMail Bridge is an application that seamlessly encrypts and decrypts your mail as it enters and leaves your computer.
It allows you to fully integrate your ProtonMail account with a third-party client that supports IMAP and SMTP protocols, such as Microsoft Outlook, Mozilla Thunderbird and Apple Mail. This includes support for importing emails into your ProtonMail account from other email accounts that are connected to the same client, as well as full-text search of your ProtonMail emails from within your client.
Currently, versions for macOS, Windows, and Linux are available on the ProtonMail Bridge homepage, along with frequently asked questions and detailed setup instructions for each of the supported clients.
The ProtonMail Bridge software is currently available only to paying ProtonMail users. However, this may change in the future to include free users as we develop our infrastructure,