[87246] in North American Network Operators' Group
Recording the return path (was Re: Clueless anti-virus products/vendors)
daemon@ATHENA.MIT.EDU (Michael.Dillon@btradianz.com)
Mon Dec 12 06:07:04 2005
In-Reply-To: <20051210165705.GB2527@gsp.org>
To: nanog@merit.edu
From: Michael.Dillon@btradianz.com
Date: Mon, 12 Dec 2005 11:08:14 +0000
Errors-To: owner-nanog@merit.edu
> > This assumes all messages are rejected within the SMTP session.
>
> Yes, exactly and the point several of us have been making is that
> this is (a) easy (well, provided you're using a quality MTA; if not,
> then switch to one) (b) running a sane mail system (c) fast
> (d) resource-friendly and
>(e) most important of all, the _only_ way to
> avoid sending UBE in response to forgeries (which are not going away
> any time soon or quite possibly ever).
Not quite the only way. If a postprocessing step is needed,
it is trivial for the SMTP server to record any return path info
that it knows in order for the post-processor to be able to
send DSN's as accurately as the SMTP server itself.
What we have here is yet another failure of imagination.
--Michael Dillon
