How to block any type of file in attachment for google apps, customer don't have postini

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How to block any type of file in attachment for google apps, customer don't have postini AtulSachan-Power Poster 7/11/12 5:17 AM
Domain Name: a.com
Users Affected: all
Problem Description: How to block any file type attachment only from Google Apps, if we dont have postini 
Steps to Reproduce: 

How to block? 

I checked by doing listed files, and define the extension but i don't want to allow any type of file. Any available extension should be blocked in attachment.
I tired by blocking a file name but it worked once, from the next time it did not respect the block rule.

Thanks.
Re: How to block any type of file in attachment for google apps, customer don't have postini LMcKin51-Top Contributor 7/11/12 11:44 AM
Google apps will only blocks  exe  and zip filters that include .exe  see link below.