[Exim] exim 4 and antivirus

This is a multi-part message in MIME format.
--
[ Picked text/plain from multipart/alternative ]
I need to setup antivirus for our future mail server before migration, so
I have a problem to find antivirus for exim 4.

Which is the best antivirus software for use with exim 4?
Where can I find it?

Thanks in advance

--