[Mimedefang] Problem using ClamAV

Mișu Moldovan dumol at gnome.org
Sat Feb 18 10:23:43 EST 2012

În data de 18.02.12 la 16:40, David F. Skoll a scris:
> On Sat, 18 Feb 2012 17:02:24 +1100
> Jobst Schmalenbach <jobst at barrett.com.au> wrote:
> > been busy ... hence a late reply.
> > You're better of NOT using clamav through mimedefang, I used to do
> > that to. You find loads of info in the internet why hooking it to
> > sendmail is better.
> Nonsense.
> We use ClamAV from MIMEDefang on large systems and it works perfectly.

While I'm sure ClamAV is currently feasible for some systems I would  
argue it is far from working perfectly... In fact, in a MIMEDefang  
setup replicated on four reasonably busy mail servers I've found ClamAV  
daemon to be the weakest link, the number one reason for mails not  
passing through, mainly because of hangs in ClamAV's daemon.

And in that setup it was SpamAssassin doing all the heavy lifting,  
which resulted in +90% of the incoming mail being rejected before  
reaching the ClamAV filter. In the end I have disabled AV scanning  
altogether at the MTA level and relied instead on an extensive list of  
forbidden file extensions, SpamAssassin's scanning and desktop-level  
antivirus protection. That proved enough and the number of alerts for  
mail traffic jams have lowered substantially.

Just my 0.02€,

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