Norton Antivirus For Exchange 2.1 and above also allows you to block attachments either by extension or specific file name. You have to actually go into the registry to do it but it works very well.
Nemx Power Tools for Exchange (Advanced Edition) is also another great program for this purpose (I like it better than ScanMail). It adds little overhead to your Exchange environment. You can simply use the Exchange Administrator program to configure filters based on content, subject, or attachments.
There are also 2 service packs available from MS to load on the client. One for Office and one for Outlook2000. When both are loaded, all dangerous attachments are present, but unavailable. If you really need them you can go in through OWA and download the file to your hard drive.
There are about 20 file types that are blocked. (Exe, bat, vbs, js, shs, ...) I have not yet figured out how to edit the list of what is blocked.
Dan
you can edit the list thats blocked with the security update using a security form within a public folder and setting a registry key to make the client set the security rules from the form. It works great !!!!!
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