If some group wants to get serious about self-hosting email, first they need to define a new subset of the email standard for them all to conform to. Unencrypte

If some group wants to get serious about self-hosting email, first they need to define a new subset of the email standard for them all to conform to. Unencrypted C2S, unauthenticated senders, and outdated protocols like POP shouldn't be included. Make it simple to self-host. XMPP has similar flaws except even worse. Too many different feature sets floating around, too many weird/insecure defaults. It also lost the federation game. Think of HTTPS, a success story of self-hosting. The weird cases are just out of the question. You basically can't use encryption without signing, or old versions of TLS.