postgrey question

Bill Moran wmoran at
Wed Jun 1 15:01:29 PDT 2005

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:

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

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