I did what your said and here is what I got, I also attached the updated /var/log/zimbra.log:
[root@mail ~]# chkconfig sendmail off
[root@mail ~]# service sendmail off
Usage: /etc/init.d/sendmail {start|stop|restart|condrestart|status}
[root@mail ~]# service sendmail stop
Shutting down sendmail: [FAILED]
[root@mail ~]# service sendmail status
sendmail is stopped
[root@mail ~]# su zimbra
[zimbra@mail root]$ zmcontrol start
Host mail.myagilon.com
Starting ldap...Done.
Starting antispam...Done.
Starting antivirus...Done.
Starting logger...Done.
Starting mailbox...Done.
Starting mta...Done.
Starting snmp...Done.
Starting spell...Done.
[zimbra@mail root]$ zmcontrol status
Host mail.myagilon.com
antispam Running
antivirus Running
ldap Running
logger Stopped
mailbox Running
mta Stopped
snmp Stopped
spell Running |