Improving filtering of SPAM...

Christopher Kurtis Koeber ckoeber at
Fri Jun 21 02:29:23 CEST 2013

Thank you; I have not tried this and will do so.




Christopher Kurtis Koeber


From: Nick Rosier [mailto:nick.rosier at] 
Sent: Thursday, June 20, 2013 4:33 PM
To: Christopher Koeber
Cc: amavis-users at
Subject: Re: Improving filtering of SPAM...


Stupid autocorrect. s/postscript/postscreen/

Op 20-jun.-2013 22:31 schreef "Nick Rosier" <nick.rosier at
<mailto:nick.rosier at> > het volgende:

Have you activated postscript in Postfix? It was a major improvement for me.
The less spam makes it to amavisd, the better. And if you don't mind a
little delay on some mails you can also install a greylisting server. 

Wietse describes a very good strategy (which I'm using)  here:


Op 20-jun.-2013 22:19 schreef "Christopher Koeber" <ckoeber at
<mailto:ckoeber at> > het volgende:



I have AmavisD with the following software running on Gentoo Linux (Kernel
Version 3.8.13):


1.	Postfix (Version 2.10.)
2.	SpamAssassin (Version 3.3.2-r1)
3.	ClamAV (Version 0.97.7)
4.	DCC (Version 1.3.140-r1)
5.	Razor (Version 2.85-r1)

There are perhaps quite a few other packages I have installed; I just know
these are the major ones I have installed.


Anyway, everything works but quite frankly my users still get a significant
amount of spam coming through (no viruses whatsoever, so the ClamAV aspect
works great.)


The core problem is that, from what I see from the logs the score for the
spam messages gets rated lower than zero so the system is learning these
messages as ham and as such the filter becomes less effective as time goes


Now, the current install isn't completely ineffective; it catches a great
deal of spam messages but my question stems from asking what can I do to
greatly increase the accuracy.


Is there a guide somewhere on improving detection of spam with AmavisD? I
couldn't find such a guide. Much of the items mentioned for improving
SpamAssassin was within the " <> " file but I know
AmavisD ignores that (from what I read). I also know I can lower the
tag/tag2/etc. numbers but then valid mail gets caught.


Any help in this area would be much appreciated.


Thank you.

Christopher Koeber

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