Do you support ProtonMail account?
Unfortunately, you cannot connect ProtonMail accounts to Missive.
As explained on this page, the way to use ProtonMail with desktop email apps is by installing the ProtonMail Bridge. This bridge is an application that must be installed on the same computer as the email app used to read and send emails (Outlook, Thunderbird, Apple Mail, etc).
In our case, Missive is a cloud application that runs on servers. Thus, it’s not possible for us to install and run the ProtonMail Bridge on our servers.
