Virus Scanning Software

I have been given the go-ahead to replace our MS Exchange server with a SuSE based sendmail server (which is already in place, just forwarding to Exchange). Now users are just going to pop their mail from the SuSE box. However, I need virus checking done on the SuSE box. I was told McAfee has a product that does this, but it cannot scan attachments, only message bodies. Does anyone know of any Unix based products that can perform the functions of the Virus Scanning packages for MS Exchange? (Or can this be done with scripts and virus patterns?) Thankx, CC