[Mimedefang] SMTP error return after DATA?

[Nels Lindquist]

On 8 May 2003 at 15:38, Myles Uyema wrote:

> I've got spamassassin tagging spam now, but I want to try taking this a 
> step further.  I want my mail server to reject the DATA portion of the 
> e-mail if spamassassin deems it as spam.
> 
> action_bounce() seems to be almost the function I'm looking for, but it 
> sounds like the mail is accepted and then a new bounce e-mail is drafted.

Actually, action_bounce() does exactly what you want; it returns a 
reject code during the SMTP conversation.

> Is milter/mimedefang granular enough to tell sendmail to reject the mail 
> during the SMTP connection after the DATA portion is complete?

Yes.

> 552 No spam for me!
> 
> 
> Is this possible with action_bounce, filter_begin, or filter_end?

I think most people do their spamassassin_check() calls in 
filter_end.

After your spam detection code, make sure you exit the filter_end 
subroutine with "return action_bounce("No spam for me!");"

A word of caution: I wouldn't suggest bouncing e-mail at the default 
detection threshold of 5.  We mark everything between 5 and 10, and 
bounce everything at 10 or higher, and we're rejecting the vast 
majority of spam while encountering extremely few false positives.  
We also quarantine a copy of all rejected mail for later review, just 
in case.

----
Nels Lindquist <*>
Information Systems Manager
Morningstar Air Express Inc.