Spam Filter Efficiency

[Qingran Xia]

I strongly recommend you to take  use of amavisd-new to run
SpamAssassin and Clamav. Because all the things about spam and virus
checks are loaded and run in the amavisd-new daemon's process. In my
website, a Dual Xeon with 4GB ram box can check more than 500,000
messages per day. And I turn on the RBL, Razor, pyzor and URIBL checks
of SpamAssassin.

On Nov 22, 2007 12:58 PM, Mitchell Smith <mjsotn at gmail.com> wrote:
> 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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