Hi All, this is my first time posting. 
In our office we run our own mail server with Kerio connect, on a MAc oS 10.6 server machine. 
When I am in the office, I have to set the incoming mail settings to the IP address of the server (192.168.5.X) 

When I go home or out of the office I have to change this to mail.mydomain.co.nz 
While its not much of a problem, I would prefer not to have to change my mail settings all the time, how do I get it to work seamlessly whether I am in the office or at home? 

Doing some google research, I think DNS may not be set up on the Mac server. The IT guy has left our company and is proving to be difficult to work with, so its up to me now. 

Anyone know how to set up DNS correctly on Mac server 10.6? I am not technical so very simple directions please :) 
Also if someone could confirm that in fact I do need DNS for this to work, wouldn't want to waste time trying to set up DNS if it doesn't solve my problem.  

many thanks in Advance