How to disable SSLv3
Due to the recent discovery of a new SSL vulnerability (CVE-2014-3566: Poodle SSLv3), SSLv3 has been considered unsafe. This is a protocol flaw and Zimbra might include patches or configuration changes in future releases.
As a workaround, this guide will help you on how to disable SSLv3 with Zimbra. This has been tested on both ZCS 8.0.8 and 8.5.0 releases.