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