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

2003-12-01 00:12:23
Bart Schaefer <schaefer(_at_)brasslantern(_dot_)com>:
It is, according to what you (and ESR) have claimed.  The address from which
the queued message was sent is no longer valid.  If, as you assert, it is a
MUST requirement of 2821 that the return-path be valid, then any SMTP server
that continues delivery of a queued message for which the sender has since
become invalid, is violating the protocol.

I didn't say that.  There's a nuance here you're missing.

The sending MTA is conformant with RFC2821, as I read it, if it issues 
a Return-Path back to the user that preserves the MAIL FROM information,
e.g. is valid at the time the message was generated.  There is a MUST 
attached to that requirement.

The receiving MTA is conformant if, upon ascertaining that the Return-Path
is invalid, it refuses the mail for that reason.

The fact that said Return-Path may have become invalid after transmission and
before receipt is an interesting edge case which does not affect the
meaning of RFC2821 in any way.  
                <a href="";>Eric S. Raymond</a>

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