Blocking incoming emails with zip on sbs 2011

I have a sbs 2011 server and users are getting loads of viruses via email attachments coming in in .zip files.

How can i stop the emails with .zip files?
firstnetsupportAsked:
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Ahmed786Connect With a Mentor Commented:
Have u gone throught below microsoft technet article.

http://social.technet.microsoft.com/Forums/exchange/en-US/1391195f-3a99-4379-8a79-6937b49137b5/how-can-i-block-file-attachments-based-on-extension-with-exchange-2007


This can be done by Transport rule on Edge server if u have or the Hub transport server.

you can set message that your company doesn't supports .zip files or else u can simply drop this without NDR to others.
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firstnetsupportAuthor Commented:
ive followed the second link and set that up it works BUT its blocking emails with "zip" in the subject line (even though ive only told it to look at the attachments)
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Simon Butler (Sembee)ConsultantCommented:
The ZIP file method is very old and a decent Exchange integrated anti spam/AV tool should be able to deal with them. The attachment filtering options built in to Exchange are a bit of blunt instrument - they just block everything which is a ZIP file, whereas a tool will actually look at the included files to strip them.

This is something you are going to need third party software to do.

Simon.
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