Just IMHO but zip files require an external program that must extract the file and then run them. If your users are blindly opening zip files and executing their contents, there is a bigger problem. Your hope would be that if somehow a zip file with a virus slipped through, it would be caught by your desktop AV client. If it doesn't already, Norton for Imail should scan inside of zip files.
Actually, it now gets a lot more complex than that.
First, users aren't just blindly opening .ZIP files and executing their contents -- they are do that *and* supplying a password that the virus gave them.
Second, no mailserver virus scanner can accurately detect all viruses in encrypted .ZIP files (believe me; it's true).
Third, as a result of #1 and #2, the only way to block all known viruses is by blocking all encrypted .ZIP and .RAR files (I'm not sure if Norton for IMail does this yet; I do know that Declude Virus does).
-Scott
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