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I'm not positive on that one, but it may have something to do with the end of life of clamav on that version of Zimbra. You may want to upgrade to at least ZCS 5.0.18. But like I said I'm not positive so you may have to do a little research.
I thought that is problem with clamav so I updated clamav on version-0.96, but without any changes.
I will try update to higher version and i will hope