Gordon,
GF> Reply-To: (RFC 822/2822) could serve the purpose
GF> of being able to send on behalf of another entity.
That would change the 25+ year semantics of Reply-to.
GF> The moment I start seeing MAIL FROM:<paypalspoofer(_at_)aol(_dot_)com>
sending
GF> From: service(_at_)paypal(_dot_)com under an envelope-only verification
system, I'll
GF> start matching headers to envelopes and bouncing mail.
It is already done by legitimate subscription bulk mail senders.
The redirection of bounce messages to special servers is a core part of
serious bulk mail services.
d/
--
Dave Crocker <dcrocker-at-brandenburg-dot-com>
Brandenburg InternetWorking <www.brandenburg.com>
Sunnyvale, CA USA <tel:+1.408.246.8253>