postgrey question

[Bill Moran]

Chad Leigh -- Shire.Net LLC said:
>
> On Jun 1, 2005, at 8:07 AM, Bart Silverstrim wrote:
>
>> I've been looking into ways of improving our spam filtering.
>> Currently I'm running postfix with amavisd-new (spamassassin and
>> clamav), and saw an article on greylisting using postgrey.  Turns
>> out there's a port for it already in FreeBSD.
>
> I don't run postifx and the thing I am about to mention I have not
> tried yet, but you may want to explore modifying your greylisting to
> be based on spamassassin results.
>
> I use exim as the mta and there is a thing called sa-exim that lets
> you run spamassassin at SMTP time so that you can reject mail if you
> want before you actually are finished receiving it.  The author of sa-
> exim has modified it to do greylisting based on spamassassing scores
> generated at smtp time, so that you only greylist mail that is
> thought to be spam and do not inconvenience your regular users.
>
> Can you do spamassassin at smtp time with postfix?

Yes you can.  I recommend this.  The postfix docs explain how to do it:
http://www.postfix.org/SMTPD_PROXY_README.html

I've used this technique and find it very helpful, as it makes bounce
messages (caused by spam and viruses) nonexistent.

-- 
Bill Moran
Potential Technologies
http://www.potentialtech.com