Frank Ellermann writes:
Let's face it, the original (working) SMTP never had a "keep the reverse
path as is" for forwarding, and RFC 1123 5.3.6(a) was the worst error in
protocol design I'm aware of. "Modify RCPT TO and keep MAIL FROM as is"
is a doomed strategy.
Wrong! Whatever you think of 1123 5.3.6(a), it simply documented what
was already nearly-universal practice. Conventional postal service,
which is the model for SMTP, does not alter the envelope 'from' when
forwarding mail, because forwarding does not change whom the mail is
really from. SMTP practice was (and mostly still is) simply to do
what postal mail has done for many years before email existed. I, for
one, still think it's the Right Way, and I use SRS when forwarding
only because I have to in an SPF'd world. In the long run, "Modify
MAIL FROM" will be the doomed strategy because it amounts to lieing
about whom the mail is from.
--
Dick St.Peters, stpeters(_at_)NetHeaven(_dot_)com
Gatekeeper, NetHeaven, Saratoga Springs, NY
Oldest Internet service based in the Adirondack-Albany region
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