[apayan]

> One thing I've actually not seen is E2E contacts & calendars. Everything seems to be based on CalDAV & CardDAV which I think forces you to sync them with a server in plaintext. Email is mostly a lost cause, the closest you could approach it is something like protonmail AFAIK.

Totally agree. I think the natural progression of things to replace would be contacts and then calendaring. For the life of me, I can't figure out what should/how to replace email. Or simply make it more secure for the masses.

[novok]

I don't think you should bother with email. If you want privacy in your communications, use signal or matrix. Making a replacement for email that is E2EE is a much bigger problem that I think would take something like signal messenger to add something like oauth & domain support.

[tasn]

etesync.com already does it, and has it for years. Open source and an open protocol. Supported in GNOME and KDE (starting from the next version) and a lot of clients for other platforms too.

Disclaimer: I created it.