Description:

Clam AntiVirus is an anti-virus toolkit for Unix. The main purpose
of this software is the integration with mail seversions (attachment
scanning). The package provides a flexible and scalable
multi-threaded daemon, a commandline 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 in your own software.

You can build clamav with some conditional build swithes;

(ie. use with rpm --rebuild):
--with[out] milter Build clamav-milter (default)