Dear All;

I upgraded my box from Zimbra 7.2.2 on Centos 6.4 to Zimbra 7.2.3 ..but after upgrade emails can't be sent within the local domain or to external domain..it was working fine on 7.2.2..any help is much appreciated...browsed the forum but can't find the right solution..everything is running when I checked the status..

[zimbra@webmail ~]$ zmcontrol status
Host webmail.x.z.y
antispam Running
antivirus Running
ldap Running
logger Running
mailbox Running
mta Running
snmp Running
spell Running
stats Running
zmconfigd Running
[zimbra@webmail ~]$

zimbra log:
ar 20 17:23:00 webmail postfix/error[1393]: 7CA203941671: to=<name@x.z.y>, relay=none, delay=0.19, delays=0.08/0/0/0.11, dsn=4.3.0, status=deferred (mail transport unavailable)


I did the same upgrade for the other box and it is running fine...I dont know where to look for anymore..pls help..