I agree that blocking .exe .doc and .xls files are a mistake. We tried it briefly and quickly stopped it. I do not think, though there is anything wrong with block .pif, .vbs, .scr, and .bat from coming through. They are nonstandard for the average user to send, and those people who are sending them are technical enough that if you explained your reasoning, would agree.

A good solution is a package like exim and create mail filters via exim. Here you can block out files with those extensions and also create custom filters for certain .exe's that you know are virii currently being sent through the internet.

Grinler