I am not really sure where to start with this one...

I have a small network setup with some linux servers (Ubuntu 11.04 Server).

2 servers are running BIND 9 (NS01, NS02), they are configured as master and slave respectively.

1 server is running Zimbra ZCS 7.1.1 (MX01), it has a private BIND 9 server running to achieve a split DNS configuration. This DNS server does not interact with the other two, it forwards queries it can resolve to the other 2 that is it. No zone transfers.

Zimbra is hosting 3 domains at the moment, solignis.local, solignis.com, campbellsurvey.net.

The problem

From with in my network I cannot connect to mail.campbellsurvey.net. When I mean I cannot connect, I mean if I open firefox and type https://mail.campbellsurvey.net I go nowhere, the address is supposed to connect to my Zimbra webmail. But it goes nowhere, the odd thing is if I try the same task from outside of the network it brings the website up like normal.

If I try to create an account in thunderbird to connect to the same server using IMAP4 or POP3 I get an error saying that thunderbird cannot find the domain name. Even the zimbra client fails too.

It is like from with in my own walls that campbellsurvey.net does not exist. But if step outside I can get it work with no problem at all.

I had thought maybe the problem was with the DNS server (BIND 9), so just to eliminate it as a possibility I configured a windows server I use for VMware VCenter as a DNS server to see what would happen. The result was the same, its like something is preventing connections to those domains, but I have checked various firewalls and such. I checked port forwards, etc. So I am running out of ideas

I know this is not a lot of information to work from and I can give more details about certain things as needed. I am just trying to figure out what could be going wrong.

Any help you could offer would be much appreciated.