Changing SMTP would create a lot of interoperability problems. I agree with this. This is why I concluded that we need a new protocol that solves the problem of

Changing SMTP would create a lot of interoperability problems. I agree with this. This is why I concluded that we need a new protocol that solves the problem of SMTP. If it's good it will take over SMTP's market share. That's the way to go. It's like IMAP taking over market share of POP, ... It's been some years now that I'm thinking on this messaging and spamming problem. It is not a protocol or technical issue. The problem is the abuse of the communication system by spammer. The worst is that people have to hide their contact address or use semi private messaging systems. This is totally contradictory to the evolution of the communication systems. We have smartphones and can't reliably send a message to any body in the world ? Internet is lacking a solution for that.