active directory & exchange login domain

Hi there,
   I'm having some trouble with understanding the configuration of our Domain Controllers with our exchange setup. All our users are setup to use exchange recepient policies filtered to the second half of their login name.

e.g. ajohns - "@domain.com" < the domain.com bit

Under active directory when I create a new user it asks me to choose a postfix to the login (the @domain.com) bit but I dont understand where it gets this list of domains from?

I've attached some screenshots to better explain. Any help would be appreciated.

Thanks

Lee
login.bmp
policy.bmp
Bill-KnockerAsked:
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oBdACommented:
That's the UPN suffix ("User Principal Name") that can be used to logon to the domain, it has nothing to do with the Exchange email address.
By default, the UPN suffix is the AD domain name; you can add other suffixes (if you want to match a user's UPN with his email address, for example) in Active Directory Domains and Trusts (that's where you'll find any suffices you might have that are different from your AD name).
Add user principal name suffixes
http://technet.microsoft.com/en-us/library/cc756018.aspx
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Bill-KnockerAuthor Commented:
thanks for the quick reply,
   I have added the UPN suffix to domains and trusts, however it has not appeared in the list on any of the domain controllers, is there a command I can run to get it to propergate through correctly?

thanks

lee
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oBdACommented:
Should appear in a short while; you might have to restart the ADUC console.
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Windows Server 2003

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