We have tried setting up Imail rules for filtering executable content. We found that it would inadvertently trap some good emails because of the .com extension on urls. I emailed Imail support and the tech's response was that the rules work most of the time but Imail wasn't designed to filter attachments and therefore the rules couldn't be counted on to work for this purpose. We still have the rules in there due to the danger of executable file types but I would like to hear from anyone that has rules that work without occasionally nailing good messages.
It just isn't possible for .com files. Filters are not flexible enough to block attachments with a high level of accuracy.
I would recommend searching the archives for pointers on how to catch the most amount of attachments with filters while minimizing the amount of legitimate mail that gets caught. There is a lot to it.
Alternatively, you can use software that is designed to block attachments, which should block them with 100% accuracy. Many AV programs (such as Declude Virus) let you do this.
-Scott
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