You've given no details of which version (and release) of Zimbra you're using, which operating system you're using, whether it's a new install or an upgrade nor whether it's a single or multi-server set-up. Have you searched the forums for this problem? There are several threads that cover this topic (with solutions) including a troubleshooting article in the wiki, please check those first and try some of the solutions.
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Regards
Bill
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