Hm, have you tried clearing the amavis DB on the problematic server? (See /opt/zimbra/amavisd-new-2.5.2/db), and verified that /opt/zimbra/amavisd is linked to the right release?
IIRC one of the RCs didn't migrate amavis correctly.
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Quanah Gibson-Mount
Sr. Member of Technical Staff
Zimbra, Inc
A Division of VMware, Inc.
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