While installing ZCS you need to disable postfix, since it has own mta running on the server on which you install ZCS. If you forget to stop postfix service you'll get this error while you attempt to send the mail from zimbra mail server.
First test mta service for zimbra
[root@ha1 ~]$ su - zimbra
[zimbra@ha1 ~]$ zmcontrol status
Host ha1.gil.net
antispam Running
antivirus Running
ldap Running
logger Running
mailbox Running
mta Stopped
postfix is not running
snmp Running
spell Running
stats Running
zmconfigd Running
mta is stopped so, postfix must be running, check it stop.
[root@ha1 ~]# /etc/init.d/postfix status
master (pid 31718) is running...
Now stop it and also from start up.
[root@ha1 ~]# /etc/init.d/postfix stop
[root@ha1 ~]# chkconfig postfix off
[root@ha1 ~]# chkconfig --list postfix
postfix 0:off 1:off 2:off 3:off 4:off 5:off 6:off
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