A lot of messaging systems try to reinvent the email system but many (signal, matrix, xmpp) took over one key traditional design which we actually dropped while retaining SMTP/IMAP compatibility: server-controlled identities.

With #chatmail user identities are cryptographic and reside on end user devices only. Servers are only message relays and have no control over identities or chats, only perform fast message routing. See this fosdem talk by one of our lead developers https://mirror.cyberbits.eu/fosdem/2026/ud2218a/3F9VTU-deltachat-chatmail-relays-multi-transport.av1.webm

Hi @delta
You wrote :
> With #chatmail user identities are cryptographic and reside on end user devices only

Is it similar as the solution developed by #Jami #hubzilla #simplex or #nostr ? A kind of p2p with relay network?

@lascapi @delta

Kind of, yes! The relays in questions are made with off-the-shelf software like Dovecot and Postfix, configured to have low retention times, require 0 data to register, and for metadata minimization (which improves steadily every now and then)

but technically speaking, it's SMTP and IMAP. Except you'd never know that it is by just using it :P