A Split DNS avoids this problem by providing an internal DNS server that can be used to resolve the internal address of the server. This guide will detail how to set up a very specific, single-host DNS server that can be installed on the Zimbra host itself so that it can resolve its own address. This should not be used for a multi-node Zimbra installation, and should not be used as the DNS server for any other hosts on your network.
http://wiki.zimbra.com/index.php?title=Split_dnsTuesday, April 24, 2007
Split DNS
Installations of Zimbra behind a firewall often require the creation of some form of split DNS. This is because the Postfix mail system used by Zimbra performs a DNS lookup when attempting to route email to the back-end message store. Frequently, this is the same physical host as Postfix. The DNS server frequently returns the external address of the mail host, not the internal address. Depending on how the firewall and network are configured, the external address may not even be reachable from the mail host, and mail will not be delivered.
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