Anti Virus for mail server

[James Godwin]

Hi,

There has been no need for Anti Virus on our mail servers as most of our
clients are Mac users and our windows clients have anti virus installed on
their machines.

Keeping windows virus updated updated is a mission so I was wondering what
the ideal Anti Virus app I should use for our Sendmail and Qmail servers?

Any ideas would be much appreciated.

Kind regards,

James