Jon,
Since this point is frequently confusing:
JK> ...at least it's generally agreed that MAIL FROM gives a
JK> *sender* identification. On the other hand, HELO identifies the SMTP
JK> *client*. ...
In spite of its name and in spite of RFC2821's reference to "source
address", Mail-From identifies an address to receive bounces and says
nothing at all about the sender.
d/
--
Dave Crocker <dcrocker-at-brandenburg-dot-com>
Brandenburg InternetWorking <www.brandenburg.com>
Sunnyvale, CA USA <tel:+1.408.246.8253>