I've been researching on essentially the best messaging apps that aren't Matrix or Signal, as while they're top notch services, I was curious what I could use that had no reliance on a central server. This turned out to be a huge rabbit hole and something that is next to impossible to find. Briar has no desktop clients (bar a scuffed Debian client), Tox leaks more metadata than Discord, Jami is so unstable that it can barely be classified as "ready for use", etc. It shouldn't be this hard.
@ThreeBadgersInATrenchcoat Did you check this out? https://delta.chat/en/
@ThreeBadgersInATrenchcoat Its not based on email in that sense, you use just imap/smtp of your email provider to send encrypted messages and encryption is done by Autocrypt standard, its e2e of course. Signal is different in terms of encryption protocol (it uses famous signal protocol) and its central service, delta chat is distributed in ways that two recipients may use different email providers. Downside (and deal breaker for me) is no support for forward secrecy by delta chat