Add domain in user account drop down

Can anyone tell me where you add in your e-mail domain name so it shows up in the drop down to the right of the username in a users active directory account on server 2003? Currently it has @domain.local and would like to be my companymaildomain.com

Thanks,

Jeff
jeffreychorbaAsked:
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Zac HarrisSystems Administrator Commented:
Try this:

Adding a UPN Suffix to a Forest

    Open Active Directory Domains and Trusts.
   
 Right-click Active Directory Domains and Trusts in the Tree window pane, and then click Properties.

 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.

Now when you add users to the forest, you can select the new UPN suffix to complete the user's logon name.

source: http://support.microsoft.com/kb/243629
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