How to unblock zip attachment in zimbra?

This is using zimbra collaboration suite 6.0.12. A lot of users came to me and told me that their zip file attachment were blocked and can't send. Now, my management wants to unblock this zip file, how to allow it in the zimbra?
MezzutOzilAsked:
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bz43Commented:
Hi, not going for points because i don't have an answer only link.

This link talks about managing the Zimbra Collaboration Suite.  In Managing Global Configurations and Global Attachment Settings .
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bz43Commented:
quick fix: have sender rename the "filename.zip" file to "filename.txt".  Then send the file.  Have receiver manually rename file back to "filename.zip".
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Duncan RoeSoftware DeveloperCommented:
At work we use a convention of appending .append.txt. This makes it obvious to the recipient what to do with e.g. filename.zip.append.txt
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MezzutOzilAuthor Commented:
Does zimbra got the function to allow/deny attachment based on file extension?
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Duncan RoeSoftware DeveloperCommented:
I wouldn't know. Most filters I've encountered do work that way though. The reason they do is quite simple: most mail clients (even those outside the Microsoft world) will try to open a file based on its extension. So for example if the extension is .txt, little harm can result. If it's .exe and you're on a Windows system, well...
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MezzutOzilAuthor Commented:
ok
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