When talking about a Linux anti-virus, I am assuming that you mean a solution to catch Windows email viruses passing through a Linux mail server or some other network gateway. F-Secure Anti-Virus for Linux seems to work fairly well. There are also some free email virus scanners. On the other hand, deploying anti-virus on Linux desktops and servers for their own protection at this time has a questionalble return on investment since there are no threatening Linux viruses to speak of now and in the near future. Also, a host firewall and hardened configuration will improve Linux protection against worms and other network malware.
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