Add another domain to existing 2003 AD

Posted on 2009-04-23
Last Modified: 2012-05-06
Here's the situation.  I have an existing 2003 AD domain w/ Exchange 2003 (  I've added another SMTP domain ( through Recipient Policy and added the appropriate mx records & A records and all works fine.

Question is, users still have to login using their credentials w/ (  I need to be able to add a user and select his/her User logon name: w/ the new email address domain (

Thanks in advance,
Question by:art1333
    LVL 14

    Accepted Solution

    What you want is to add an additional UPN suffix for your domain.

    Follow the instructions below. (
    1. Open Active Directory Domains and Trusts.
    2. Right-click Active Directory Domains and Trusts in the Tree window pane, and then click Properties.
    3. On the UPN Suffixes tab, type the new UPN suffix that you would like to add to the forrest.
    Click Add, and then click OK.
    4. Now when you add users to the forest, you can select the new UPN suffix to complete the user's logon name.

    You can change the UPN suffix for the existing users using ADUC or scripting.

    LVL 21

    Assisted Solution

    Add as a UPN and put that on the affected users in your domain.


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