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Change default domain of AD namespace

Posted on 2008-06-16
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Last Modified: 2010-04-21
New installations will have the default domain of their AD namespace, how do I change this default domain to another name?

As I setup my system I started off with domain name: (myname.com)
then added prefix to represent name server (ns1)
the when I created my company that was added (mycompany)
finally on my exchange server where I also created a backup dns the name server prefix (ns3)
so my AD namespace looks like this: ns3.mycompany.ns1.myname.com

Reason I want to change this is I have mail.mycompany.com setup properly in my DNS but the AD namespace is what gets sent out when using my Exchange 2003 server, hence, AOL & AT&T reject my emails from this server due to the namespace not being what I've configured in DNS.

Hope this all makes sense, I basically want to change my default domain for Exchange to send out according to that. From "ns3.mycompany.ns1.myname.com" to "mail.mycompany.com"
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Question by:Louie Alvarez
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Expert Comment

by:tigermatt
ID: 21795501
You'll need to ensure you get the appropriate Reverse DNS records configured for mail.mycompany.com. This must be done with your ISP.

You'll also need to change the SMTP banner on Exchange to match mail.mycompany.com - see the SMTP banner section at http://www.amset.info/exchange/dnsconfig.asp to do this.

Once that's done and the only MX record you have is mail.mycompany.com, you will then be able to send to AT&T and AOL.

-tigermatt
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Author Comment

by:Louie Alvarez
ID: 21796100
Thanks, changing the SMTP banner was simple. As for the DNS records, I have my own DNS servers in place and up to now I've assumed I had them all setup properly as I can email to anyone online with the exception of SBCGlobal.net and reading elsewhere looks like AOL will give me the same hassles. Where do I determine my Reverse DNS records are properly set in addtion to my PTR records. Is there a testing service anywhere online and directions on how to correct this?
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Expert Comment

by:tigermatt
ID: 21796131
For the reverse DNS records they must be configured at the ISP. Your ISP is the one who leases you your static IP address for your Internet connection, and they therefore own the reverse lookup namespace for that IP address. You must contact them to get the PTR record changed/set up to match mail.mycompany.com on the IP address which your Exchange Server uses to send out on.

It sounds convoluted but that's the process I'm afraid!
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Author Comment

by:Louie Alvarez
ID: 21796170
Thanks much. I'll contact the ISP and put them to work. I will have to say with such prompt responses this website is well worth subscribing to. I am most impressed with the quick response and good information. I will definitely be utilizing this service much more often. Thanks again.
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Expert Comment

by:tigermatt
ID: 21796178
You're most welcome. Are you aware of the question closing procedure?
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Author Comment

by:Louie Alvarez
ID: 21796241
Nope, how does that work
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tigermatt earned 500 total points
ID: 21796255
You assign a set number of points to every question you ask - in the case of this one, you've assigned 500 points. When an expert answers your question and you have asked any questions which are closely related to the original question, then you can assign points and close the question. To do this, you press the "Accept as solution" link next to one of MY comments above. You then follow the procedure, assign a grade and press the button to complete.

:-)
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Author Closing Comment

by:Louie Alvarez
ID: 31467692
Outstanding job, really appreciate such a prompt and accurate answer to my dilemma.
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