Do you have a firewall and/or SElinux (AppArmor) active on the zimbra server? On the Zimbra server can you do the following:
Code:
telnet localhost 53
telnet localhost 25
Do you get a response from either of those?
Code:
su - zimbra
zmcontrol status
Is everything running OK?
Please post the output of the following commands (run on the Zimbra server):
Code:
cat /etc/hosts
cat /etc/resolv.conf
dig yourdomain.com mx
dig yourdomain.com any
host `hostname`