Re: time that SMTP was updated
That's only ONE issue. White listing, black listing, security are problems.
You'd really need a completely different system. Remember too that people need to legitimately "spoof" the From on SMTP as they may have many email addresses and replying to "spoofed" From will work because somewhere a hosted mail box is forwarding to a single mail box the user uses IMAP, POP, Exchange or Web client to fetch from.
Biting the hand that feeds IT
