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This email address already exists in this organization

Hi, we recently lost an Exchange server which had its own mailboxes on it and was part of our Windows Exchange Server 2003 organization. We migrated the AD accounts to our parent domain and retired the DC using dcpromo /forceremoval. However, when we try and Create Exchange mailboxes for the new AD accounts, the SMTP is set to username2@ourdomain.com. Editing this does not work and we get the error message:
This email address
We have a recipient policy on our Exchange server.
We have manually removed the dead Exchange server from the organization using ADSIedit successfully but it seems that there are still replication references to the objects.

Any clues?

Thanks
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healthmanagement
Asked:
healthmanagement
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1 Solution
 
ob1_Commented:
This may be a dumb question but if you search in AD for one of the addresses that already exists and specify "entire directory" as your search location - does anything come up?
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healthmanagementAuthor Commented:
Hi - no, nothing comes up. Infact, I searched using the LDP tool and the values returned for the SMTP addresses were all 0. So therefore, the address really doesn't exist! However AD is still picking it up from somewhere..
I have also set the Mailbox deletion limit default from 30 to 1 day, to see if it will "replicate itself out". I have seriously tried a lot of things..Hence the 250 points.
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ob1_Commented:
Are you having replication issues? If you run dcdiag does everything pass?
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healthmanagementAuthor Commented:
Dcdiag all ok
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ob1_Commented:
What about on your other DC's - how many are there? Can you run dcdiag there as well to make sure no replication issues?
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Would like to know few things is there a problem with creating a New mailbox or is that the email is not getting stamped or something else. Could you please share some more info. Thnax
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GhousullahCommented:
Hi,
Please clarify below questions.

Did you had a separate child domain below the parent domain? (eg: abc.xyz.com)
 If yes, did they also had the same recipient policy of your parent domain. (Mean members in child domain also had the same email ID as user1@xyz.com.)

If it is the case then your Parent domain will have the partial info of your child domain and its accounts. So just doing dcpromo /forceremoval will not help.

And moreover if you have migrated the users from the crashed domain to parent domain, obviouly you wll have the users in ur parent domain. So even if you create the account in parent domain or in child domain, you will get this types of errors.





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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Any updates on the issue ?
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healthmanagementAuthor Commented:
Hi - yes we fixed it. After doing the/dcpromo /forceremoval, we then had to do a metadata cleanup from NTDSUTILS on the master DC. This removed all references to the child domain, and hey presto we were able to create email accounts of our liking, at will.
http://support.microsoft.com/kb/887424/
Thanks for your comments.
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