Ted,
TH> I believe the point we're trying to reach is:
TH> "* The MTA from which my MTA received this message is listed as being
TH> allowed to send mail on behalf of the domain listed in the message
TH> (or not)."
"domain listed in the message" could mean the RFC2822 From, RFC2822
Sender, the SMTP Mail-From, or possibly even the SMTP EHLO.
Beyond "listed in the message" is being authorized by the containing
service provider to act as a client MTA.
(I'll leave out RFC2822 Reply-To, since I do not think anyone considers
it a viable example.)
These involve very different identity roles.
d/
--
Dave Crocker <dcrocker-at-brandenburg-dot-com>
Brandenburg InternetWorking <www.brandenburg.com>
Sunnyvale, CA USA <tel:+1.408.246.8253>