Zimbra Installation DNS issue

[ddurst@mechdrives.com]

I am currently experiencing a issue installation Zimbra.
My current network configuration is:

INTERNET ---> Firewall---> Baracuda ---> Zimbra E-Mail Server

My issue is I have named the zimbra server mail.mydomain.com
in my setup. When the Zimbra MTA receives a email for mail.mydomain.com it attempts to DNS lookup mail.mydomain.com
and gets a external IP Address and trys to relay that back to the external IP.

I have configured /etc/hosts as follows:

order hosts,bind
127.0.0.1 localhost.localdomain localhost
10.1.5.120 mail.mydomain.com mail
::1 localhost6.localdomain6 localhost6

Unfortunately when I do a:
host mail.mydomain.com
I receive a:
mail.mydomain.com has address ***.***.***.***

Can anyone point me in the proper direction to resolve my issue?

[uxbod]

Welcome to the forums

You will require a Split DNS - Zimbra :: Wiki architecture.