linux security - Jan 2000 - Scan mail for Virus

Hello,

could someone send me information, how to protect my email gateway with a
virus-protection programm?
I''m running a sendmail-server on SUSE 6.2.
I allready scan with Sophos my hard disk every night.
Is there a interface, or something else in sendmail to call a
virus-protection programm?

Harald Kie_ling