Relay MTA for external Delivery

[SETR]

Hi,

I have had a problem with ZCS v 5.0.4. When I leave blank Relay MTA for external delivery, mails are deffered. When I fill out this item all mails are delivered. I using network with NAT , but ZCS server is in DMZ ( demilitarized zone).

Please help.

Sorry for my English.

George

[irfan]

Welcome to Forums

What exactly you enter there which enables mail delivery?
What errors you see in zimbra.log when mails are deffered?

What is the output of these commands:

su - zimbra
zmprov gs `zmhostname ` |grep zimbraMtaRelayHost
zmprov gs `zmhostname` |grep zimbraMtaDnsLookupsEnabled