[Feld0]

What would a spam-resistant successor to today's email protocols look like? Is such a thing in the works by someone?

[jsjohnst]

This is completely off topic from this thread, but one way to easily cut down on spam (that would break many email senders today) would be to require that a mail server can only send email for a domain you own. Yes, I'm familiar with DKIM and similar tools, but they don't go far enough.

[codedokode]

Another way is to accept emails only from your contact list.