This is the situation:
I have a Windows 2003 Server, PDC of domain 'MYDOMAIN', Active Directory name 'mydomain.local'. I have Exchange 2003 on it as the mail server for internet 'mydomain.com' (apart from 'mydomain.local').
'mydomain.com' is the default email address for Exchange. Everything works ok, except that it says I cannot create an email address 'email@example.com', it says the address is already created. I made some AD queries for all Exchange mailbxes and aliases, and none of them is 'mydomain', so I don't know where is that account/alias created. All other email accounts work just fine.
It's important to me because I have had this account for ages in the other email server till we decided to migrate to Exchange.
Any hints on where is that account and why wouldn't it let me create it?
PS: of course, 'mydomain' is a ficticious name, change it or whatever you want, just putting it so that you understand my domain name is the same as the email account I want to create.