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Clam AntiVirus is an open source (GPL) anti-virus toolkit, designed especially for e-mail scanning on mail gateways. It provides a number of utilities including a flexible and scalable multi-threaded daemon, a command line scanner and advanced tool for automatic database updates.
The core of the package is an anti-virus engine available in a form of shared library. The download package contains the daily updated Virus Database for ClamAV.