postgrey question

Chad Leigh -- Shire.Net LLC chad at
Wed Jun 1 15:03:39 PDT 2005

On Jun 1, 2005, at 4:01 PM, Bill Moran wrote:

> 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.

So, can you conditionally call the post_grey stuff based on this smtp- 
time spamassassin results?

That would allow you to do what I described above, which allows you  
to minimize the downside of greylisting.

Thanks bill!


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