We have an ISP. I have been experimenting with clam antivirus and have 
been quite pleased with the results but the performance is pretty 
terrible for our needs due to our mail volume. I can't qualify its 
effectiveness for virus outbreaks as it hasn't been around to see any 
live yet, but it did work for several test cases I threw at it with the 
common outlook worms. I suspect that for a home or small office (<30 
user or 100 boxes) it would work very well. We use a modified 
qmail-toaster package set available from qmailtoaster.clikka.com .

It includes in the rpms qmail-scanner which you can connect to clam 
antivirus or amavis for that matter. Clam has autoupdates but I think 
you still need to set that up separately. Config still needs to be done 
because the defaults don't work for all the distros they support. 
Overall though I have to say I am incredibly pleased with the elegance 
of the setup.

If you have are using an intel eepro nic email for some patches to qmail 
to fix some known issues with that.

Sincerely,
David Uhlman
CTO 50KM Inc.

Chris Cowan wrote:

> I currently evaluating a system to scan our email for Viruses and Spam. 
> I'm using Postfix and plan on using Amavis. I would like to hear about 
> your experiences with Virus/Spam scanners. Any suggestions would be 
> greatly appreciated.
> 
> I would prefer to us an open source solution like Clam Antivirus or Open 
> Source Antivirus. Has anyone used these scanners and what do you think?
> 
> Chris Cowan
> 
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