What is the ProtonMail IMAP/SMTP Bridge?
ProtonMail Bridge is an application that allows you to use your ProtonMail encrypted email account with your favorite desktop email client such as Thunderbird, Apple Mail, or Outlook, while simultaneously retaining the zero-access encryption and end-to-end encryption that ProtonMail provides. The best part is that this does not require modifying your email client or making changes to your existing workflow. Use email like you have always used it, and the Bridge will automatically encrypt and decrypt messages in the background.
How does the ProtonMail Bridge work?
The Bridge is an app that you download and install locally on your desktop or laptop computer and it runs automatically in the background.
ProtonMail Bridge only works for paid ProtonMail accounts – not their free offering.