On Thu, 7 Jul 2005, Alex van den Bogaerdt wrote:
Tony is under the impression that you (and I, and the rest of
the world) know when an email we send is going to be forwarded.
I don't see how that's going to be possible. I also don't see
how "551" can help here, perhaps you mean "251" ?
551 rejects the message, but tells you the new address so you
can send it again with the new address and update your address
book. When a receiver rejects on SPF fail (ignoring the forwarders
they have set up), then you get a reject, and the message usually
includes the RCPT TO address.
In fact, one easy way for a receiver to account for all the forwarders they
have lost track of is to check SPF, and on SPF FAIL issue a 551 rejection
with the RCPT TO in the message. The sender would then get a 551 DSN,
just as he would before SPF was ever invented. When you are really
changing emails, this is much preferable to maintaining a forward on
the old address forever. (I realize that many forwards exist to
tack a mycompany.com domain facade on a free and/or familiar mailbox.)
--
Stuart D. Gathman <stuart(_at_)bmsi(_dot_)com>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flamis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.