Re: [Asrg] 0. General - anti-harvesting (was Inquiry about CallerID Verification)

["Eric S. Raymond" <esr@thyrsus.com>]

Bart Schaefer <schaefer@brasslantern.com>:
> Suppose the (not uncommon case) of a sending MTA that is not the same host
> as the MX for the sender's domain.  Call these MTA1 and MX1.  A message is
> transmitted via MTA1 to the recipient's MX, which I'll call MX2.  If the
> sender mailbox is valid at MTA1 -- that is, MTA1 can successfully deliver
> a DSN to that mailbox in the event of a 5xx response from MX2 -- where is
> the requirement that the mailbox also be valid when presented as a RCPT TO:
> at MX1?

RFC2821 says the Return-Path has to be the same address that was
presented to the MAIL command.
-- 
		<a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>

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