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clamd and amavis optimization
https://forum.linode.com/viewtopic.php?f=11&t=5891
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Author:  wiseless [ Tue Aug 10, 2010 2:02 am ]
Post subject:  clamd and amavis optimization

Hello guys!

I just installed amavis/spamassassin/clamav following this guide:

https://help.ubuntu.com/community/PostfixAmavisNew

I have a Linode 768 running Ubuntu 10.4 64-bit, and clamd is taking about 22% of RAM and amavisd (installed amavisd-new) is taking about 12% for each process (master + 2 child).

Searched all around and found no tip on optimization for those two beasts I could use so far.

Can anyone give a hand? :)

Thanks in advance!

Author:  obs [ Tue Aug 10, 2010 3:00 am ]
Post subject: 

switch to 32 bit, 64 bit is wasted on a linode 768. Also consider outsourcing your email, managing an email server is generally a pain.

Author:  Vance [ Wed Aug 11, 2010 1:54 am ]
Post subject: 

There may be optimizations available, but content-based scanning is always going to be resource intensive. I recommend configuring Postfix with some basic sanity checks. Before adopting that page's settings for reject_rbl_client, look at the policies and history for those blacklists to be sure they are agreeable to you. A lot of blacklists can be overly aggressive (IMO).

I have found greylisting to be of immense value in stopping spam. The downside is that you will experience a delay in mail being delivered to you from a new source. The trade-off is worth it to me, but others have their own opinions.

Even if you feel like you cannot do away with content-based scanning completely, these methods will reduce the volume of mail that has to be processed by ClamAV and Amavis.

Author:  wiseless [ Thu Aug 12, 2010 3:30 pm ]
Post subject: 

Thanks for the advice, guys.

Simply by switching to 32 bit Ubuntu clamd now uses about 17% (versus 22% on 64-bit) and each amavisd-new process about 7% (versus 12% on 64 bit).

Since I'll serve few email accounts, but for 4 diffrerent domains, I don't think I'd bother using, for example, Google Mail unless, for some reason, I feel the need to free more resources to other tasks.

Thank you for your time and references pointed. :)

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