Duplicate Email Addresses in Active Directory/Exchange 2003

Hello,

I have two question which are related but are both very important:-
I have an urgent question regarding duplicate email addresses within Active Directory.

Question 1:-
Recently I imported x amount of users into AD using the CSVDE import inclusing email addreses.

However from doing this import  I am encountering a lot of errors like the one below:-

Your message did not reach some or all of the intended recipients.
The following recipient(s) could not be reached:

      Letsie Tilley on 21/09/2004 16:28
            The e-mail account does not exist at the organization this message was sent to.  Check the e-mail address, or contact the recipient directly to find out the correct address.
            <Exchange.ad.xbas.nhs.uk #5.1.1>


These erros are generated on reply to an email.  I believe this is to do with duplicate addresses.  Can I confirm this error is for duplicate addresses??

Question 2:-
I can delete the duplicate address when I know who are the recipents are, however how can I search for the duplicates in AD across users and contacts?  Do I need a software package to do this for me?

We are using Exchange 2003 and Active Directory 2003.

If so what might it be called?

This is matter of urgency, this is happening for my whole site.

Can someone please help me.
AJAY_MASSONAsked:
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David WilhoitConnect With a Mentor Senior Consultant, ExchangeCommented:
yea, no X.400 address for these users. Without it, it won't work. X.400 has to be there.
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David WilhoitSenior Consultant, ExchangeCommented:
Is this SMTP address you imported, on the recipient policy? If so, did you update and rebuild the RP?>

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AJAY_MASSONAuthor Commented:
No, I did not rebuild the Address List.

I just ran the import.
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David WilhoitSenior Consultant, ExchangeCommented:
Do an update/rebuild of the Recipient Update Service. Secondly, open a user object, go to the email addresses tab, and see what entries are present.

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AJAY_MASSONAuthor Commented:
I have alread run update of the Recipent Policy however I will run Rebuild now.  I know the rebuild will take time though.  

Under the email addresses tab, the entrie that is there is only SMTP.  The SMTP Address for the user or contact.

Is there anything wrong with this?


Ajay
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AJAY_MASSONAuthor Commented:
Why do I need the X.400 for these users??  I believe the company does not use X.400 anymore.

If I add X.400 for these users will this stop the NDR's on replying to an email.

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David WilhoitSenior Consultant, ExchangeCommented:
Was it the X.400 address?
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gorhamoienCommented:
I have teh same issue with certain mailboxes in Excahnge 2003. I get that the user email does not exist when it does. I also see a user which is not on the exchange server but shows up in the global address book. Will rebuild on the recipient polisy will clear this issue?
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