Comment by ploum

What I don’t understand is why there’s no effort from Proton to expose the underlying protocol between Protonmail.com and the Bridge.

This protocol should be an open source effort, allowing mail clients to implement it and other provider to implement it on their own server.

This could clearly be a major move, making unencrypted IMAP a thing of the past, allowing direct competitors (tutanota? Mailfence?) to collaborate on the bridge and on the ecosystem and targeting directly the only competitor worth talking about : Gmail.