Re:Tuta and Proton: An Open Source Client Does Not Result in...
by tcyrus on Wednesday June 10, 2026 @12:08PM
(#48478462)
The E2EE behind Tuta Mail and Proton Mail are designed around vendor lock-in. While I understand the reasoning behind the decision, it means that they were never meant to be truly "open source".
Proton Mail supports PGP encryption for external communications, but I believe Proton Mail Bridge still blocks users from sending PGP encrypted emails.
The vendor lock-in is so bad that some Proton Official Emails (specifically Zendesk Support and Standard Notes) still don't use any form of E2EE (not even PGP).
If you're interested in E2EE emails that you can host yourself, I recommend looking into Delta Chat (chatmail) and the smtp-e2eesign draft.
Proton Mail supports PGP encryption for external communications, but I believe Proton Mail Bridge still blocks users from sending PGP encrypted emails.
The vendor lock-in is so bad that some Proton Official Emails (specifically Zendesk Support and Standard Notes) still don't use any form of E2EE (not even PGP).
If you're interested in E2EE emails that you can host yourself, I recommend looking into Delta Chat (chatmail) and the smtp-e2eesign draft.