So you are receiving email with viruses. I am using Postfix, with mailscanner, spamassassin and several opensource virusscanners on a Red Hat server for my exchange servers. There is no commercial product that is better than this. I uses isa server to do smtp checks and to protect me agianst spam and so on. I also used gfi mailsecurity, but the all couldn't do the work. And it is very easy to setup and to do maintenance. Its stable and above all there are almost no costs. Regards, Rob