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klamav

Clam AntiVirus is a GPL anti-virus toolkit for UNIX. The main purpouse of this software is the integration with the mail servers (attachment scanning). The package provides a flexible and scalable multi-threaded daemon, a command line scanner, and a tool for automatic updating via Internet. The programs are based on a shared library distributed with the Clam AntiVirus package, which you can use with your own software.