How to disable the Zimbra virus scanner from blocking encrypted archives and files

If you receive this message from your Zimbra server, then it is likely that an encrypted PDF or ZIP has been quarantined simply because the Zimbra virus scanner could not examine the contents of the file.

VIRUS ALERT

Our content checker found

virus: Heuristics.Encrypted.PDF

This feature can be disabled, so that encrypted archives will pass the virus scanner. However, this does not mean that you are now vulnerable to viruses. Since the virus scanner has a database of signatures for viruses and malware, so should still be able to catch real security threats.

To disable the blocking of encrypted archives by Zimbra anti-virus scanner, perform these steps in the Zimbra Web Admin console.

References:

• http://www.gossamer-threads.com/lists/clamav/users/52257
• http://www.zimbra.com/forums/administrators/51722-content-filter-quarantined-email-2.html
• http://www.zimbra.com/forums/administrators/45957-release-quarantined-mails-2.htm