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Vote for avast! for Linux/Unix Servers
avast! for Linux/Unix Servers is an antivirus solution for the Linux and BSD environments. Considering its design and mail scanning support, it is primarily intended for Linux (or BSD) based servers; however, it can be used on desktop computers as well (pricing of the product assumes server use, though).
Thanks it its flexible deamon architecture, avast! for Linux/Unix Servers can be used for both filesystem and network traffic scanning, such as real-time monitoring of mail (SMTP) and web (HTTP) data streams.