I suggest you setup smtp authentication. I setup this kind of smtp and it seems viruses cannot authenticate by themselves.

----

Nelson Serafica

http://nelsontux.blogspot.com




----- Original Message ----
From: Jean-Paul Natola
To: lcroker@megacable.com.mx; users@spamassassin.apache.org
Sent: Friday, October 24,2008 8:05:45 AM
Subject: RE: Spamassassin+amavis

maybe if you block messages with no rdns record? if its from infected pc's
there shouldnt be a record?






________________________________

From: Luis Croker [mailto:lcroker@megacable.com.mx]
Sent: Thu 10/23/2008 19:56
To: users@spamassassin.apache.org
Subject: Spamassassin+amavis



Hi...

I have a mail server with FreeBSD 7.0, postfix+amavis-new+spamassassin. We
are an ISP and I need to filter the spam that our susbribers are sending to
internet, the PCs have some malware or are botnets. These PCs generates a
lot of spam each day.

The server filters a los of Spam but some times the queue is so crowded. I
have to questions...
Do you have any recomendation to improve the performance onthe server ??

How can I catch more spam than the seerver is filtering ? The server blocks
many messages but another spam messages goes to internet cause the score
does not reach the parameters to be blocked.

thanks a lot. Regards.


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