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

Wed Apr 12 02:50:42 UTC 2006

On 4/11/06, Matthew Black <black at 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 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.

-srs