Great. Thanks for the feedback.
What sort of 2821.MailFrom validation was PostFIX doing back in 99?
So we have:
Exim SMTP server
PostFix SMTP server
WIldcat! SMTP server
all doing MAIL FROM delayed validation. How about SendMail?
Sincerely,
Hector Santos, CTO
Santronics Software, Inc.
http://www.santronics.com
305-431-2846 Cell
305-248-3204 Office
----- Original Message -----
From: "Wietse Venema" <wietse(_at_)porcupine(_dot_)org>
To: <ietf-mxcomp(_at_)imc(_dot_)org>
Sent: Friday, September 24, 2004 12:26 PM
Subject: Re: WG to close ; Re: Make CSV backwards compatible with SPF? (new
revisions)
Hector Santos:
See RFC 2821 Section 3.3:
| 3.3 Mail Transactions
|
| .....
|
| ............. Despite the apparent
| scope of this requirement, there are circumstances in which the
| acceptability of the reverse-path may not be determined until one or
| more forward-paths (in RCPT commands) can be examined. In those
| cases, the server MAY reasonably accept the reverse-path (with a 250
| reply) and then report problems after the forward-paths are received
| and examined. Normally, failures produce 550 or 553 replies.
This is probably the most powerful concepts in RFC 2821 for anti-spam
operations. It opens the door for Mail From Validation and it offers
performance enhancement and overhead reductionn. We are probably among
the
first, if the the only product in the market to have implemented this
recommendation.
The Postfix MTA does this by default since 19990510 (May 10, 1999),
according to the day-to-day log.
Wietse