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Internal & External Domain Names with Exchange

Can anyone tell me the best method for internal and external domain naming in regards to Exchange?  Here is my current scenario:

I have a windows 2003 server that hosts AD, DNS, terminal server and a host of applications.  The current domain is structured as mydomain.com.  I also have 1 Exchange 2007 server running on top of windows 2008 linked to the mydomain.com.  My external domain name is identical to my internal domain name of 'mydomain.com'.

What I want to do is off load AD and DNS to it's own Windows 2008 server as well as change my internal domain name from 'mydomain.com' to 'intra.mydomain.com'.

My main question is this - If I create a new domain called 'intra.mydomain.com' do I have to keep another DC running with the 'mydomain.com' for Exchange purposes or can I build a new Exchange server based on 'intra.mydomain.com' but still receive email from outside the organization sent to 'joeuser@mydomain.com'?  If I do associate my Exchange server with 'intra.mydomain.com' I've read how Exchange can receive and process email from different domains, but how do I change the email domain name so it looks like it is coming from '@mydomain.com'?

Any advice or suggestions is greatly appreciated
1 Solution
Glen KnightCommented:
have a read of my article here: http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Windows_Server_2008/A_3575-Choosing-the-correct-domain-name.html

If you are using Exchange other than 2003 you cannot rename the domain it's on, but really there is no need to.

You can receive emails for any external domain you own simply by adding an additional domain, another article of mine here: http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_3982-Additional-Domain-for-Exchange-2010.html
a245439Author Commented:
Thanks demazter, I will take a look at both articles.
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