Run the following command and post the output here:
Code:
zmprov gs `zmhostname` | grep zimbraServiceEnabled
zimbraServiceEnabled: antispam
zimbraServiceEnabled: logger
zimbraServiceEnabled: mailbox
zimbraServiceEnabled: mta
zimbraServiceEnabled: stats
zimbraServiceEnabled: snmp
zimbraServiceEnabled: ldap
zimbraServiceEnabled: spell
zimbraServiceEnabled: Antivirus
Read the following wiki article:
Mail Queue Monitoring - Zimbra :: Wiki
You should also tell us which version of ZImbra that you're having the problem with, what's the output of: