[89893] in North American Network Operators' Group
Spam filtering bcps [was Re: Open Letter to D-Link about their NTP vandalism]
daemon@ATHENA.MIT.EDU (Suresh Ramasubramanian)
Tue Apr 11 22:51:11 2006
Date: Wed, 12 Apr 2006 08:20:42 +0530
From: "Suresh Ramasubramanian" <ops.lists@gmail.com>
To: "Matthew Black" <black@csulb.edu>
Cc: nanog@merit.edu
Errors-To: owner-nanog@merit.edu
On 4/11/06, Matthew Black <black@csulb.edu> wrote:
>
> Are you suggesting that we configure our e-mail servers to notify
> people upon automatic deletion of spam? Frequently, spam cannot be
> properly identified until closure of the SMTP conversation and that
> final 200 mMESSAGE ACCEPTED...or do you think that TCP/IP connection
> should be held open until the message can be scanned for spam and
> viruses just so we can give a 550 MESSAGE REJECTED error instead of
> silently dropping it?
>
You can reject right after DATA, at the <CR><LF>.<CR><LF> stage, before QUI=
T
That's still an in line smtp reject rather than an accept + bounce DSN.
Exim with the spamassassin patches (sa-exim) does this, for example.
-srs
