Hello Mark,
This article has step by step instructions on what you are looking for.
172953 How to Install and Configure Microsoft DNS Server
http://support.microsoft.com/?id=172953

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Mohanchand Koduri [MSFT]
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> How would I setup mx records on NT dns? My domain is called mydomain.com and
> I have mail sent to @mydomain.com how would the records be setup? Also, I
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>
> Mark