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User Principal Name Confusion

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  • User Principal Name Confusion

    In our Windows 2003 AD domain we have one forest and one root domain. The root domain is for example "" so my UPN is [email protected]. We also run Exhange 2003 and I have recipient policies and email addresses for "" and "". When I look at the Account tab of my user object in ADUC I see "" and "" in the UPN suffix dropdown. In ADDAT I do not have any additional UPN suffuxes listed. My question is why is the "" UPN suffix available? Is it because I have a "" email address? I thought additional UPN suffixes (other than the default one created when the domain is created) have to be created in ADDAT?