Date: Thu, 22 Nov 2007 14:58:37 +1000 From: "Mitchell Smith" <mjsotn@gmail.com> To: <freebsd-isp@freebsd.org> Subject: Spam Filter Efficiency Message-ID: <00c401c82cc4$5bcd6a20$580116ac@mjspcbook>
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Greetings List, I apologize if this topic has already been raised, however I would like = some feedback on how people are managing spam in high volume email = environments. To give you a little background, our organization currently has three = reasonably powerful boxes (dual XEON with 4GB ram), processing about = 800000 messages a day (total) and are seriously struggling under the load. Our configuration consists of Postfix with a couple of RBL checks, GLD = greylisting (central MySQL db), which falls through to MailScanner which = filters with SpamAssassin / Clamav. >From the mail scanners, the emails are the forwarded (via an LDAP = lookup) to a specific Cyrus mail store. We have turned off DCC checks in SpamAssassin which has improved = performance quite a bit, however we are still doing Razor checks. We have investigated a couple of commercial solutions which clamed to be = able to handle more than our quantity of mail on one box, however the = spectacular pricetags associated with such solutions suggest we won't be moving = forward with these any time soon. We are also looking at other open source solutions such as amavis / = dspam to see if we can try and improve the throughput on our current = hardware. What I would like some feedback on is if anyone has already gone down = this path and found one solution that performs better than another, or = if anyone is using a similar setup to ours and has found better ways to optimise it. I would very much appreciate some feedback either on or off list please, = as to how other people might be tackling this same problem. Cheers
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