North American Network Operators Group

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Re: Spam filtering bcps [was Re: Open Letter to D-Link about their NTPvandalism]

  • From: Matthew Sullivan
  • Date: Wed Apr 12 08:19:40 2006

Suresh Ramasubramanian wrote:

On 4/11/06, Matthew Black <[email protected]> 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 QUIT

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.


Of course Postfix can be setup (using spampd) with spamassassin to do exactly the same.

I believe Sendmail+MimeDefang+Spamassassin will also reject inline if set to do so.