[87267] in North American Network Operators' Group
Re: SMTP store and forward requires DSN for integrity
daemon@ATHENA.MIT.EDU (Matt Sergeant)
Mon Dec 12 14:23:46 2005
In-Reply-To: <1134251678.581.225.camel@bash.adsl-64-142-13-68>
Cc: Andrew - Supernews <andrew@supernews.net>, nanog@merit.edu
From: Matt Sergeant <msergeant@messagelabs.com>
Date: Mon, 12 Dec 2005 14:23:14 -0500
To: Douglas Otis <dotis@mail-abuse.org>
Errors-To: owner-nanog@merit.edu
On 10 Dec 2005, at 16:54, Douglas Otis wrote:
> The BATV is a few lines of code that adds a private tag with a time
> limit set in days. BATV helps dramatically by eliminating the DATA
> phase
> and all that is involved in handling messages. In addition, once BATV
> becomes more widely deployed, the DSN refusal offers an alert about
> accepting more such messages from that IP address.
>
> BATV will make forged DSNs a thing of the past, irrespective of where a
> recipient list is checked, an AV or SPAM filter is added, etc.
And BATV will never be widely deployed because it breaks every single
system out there that keys off the return path. And there are a lot of
these systems.
Matt.
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