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Why am I getting NDR's for mailboxes that don't exist?

I have a client running Exchange Server 2003 on a Windows Server Small Business Server 2003 box.  All clients of the Exchange Server are using Outlook 2003 or Outlook 2007.  So, here's what is generating the NDR's.  Person A (using Outlook 2007) is sending an e-mail to person B (using Outlook 2003).  Person B receives the e-mail.  Person A receives an NDR that the mailboxes for Person C and Person D (previous employees of the company) do not exist.

Person A is sending the e-mail directly to a singular contact in the Global Address List, not a group or distribution list.  

The contact info for Person D looks clean in the GAL, as when the details for the contact come up, no data concerning Person C or Person D is there.  

I have checked Active Directory and Person B is not forwarding his e-mail to anyone.  Normally, I would just delete the contact and re-add it to the contact list to clear up any discrepancies of this nature in Outlook, but since the contact is in the GAL, I have no idea what is going on.

Anybody else seen this?  I have sent a copy of the NDR below, modified to protect company names.
_____________________________________________________________
From:   System Administrator  
Sent:   Monday, February 09, 2009 3:02 PM
To:     Person A
Subject:        Undeliverable: Updated: Call Chris with ABC Widget Company

Your message did not reach some or all of the intended recipients.

      Subject:  Updated: Call Chris with ABC Widget Company
      Sent:     2/9/2009 3:02 PM

The following recipient(s) could not be reached:

      Person C on 2/9/2009 3:02 PM
            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.

            <Client_Company_Name.com #5.1.1>

      Person D on 2/9/2009 3:02 PM
            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.

            <Client_Company_Name.com #5.1.1>
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clenh2o
Asked:
clenh2o
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1 Solution
 
rylanddCommented:
Does Person B have rules in Outlook setup to forward mails to other people maybe?

You could also use the Message Tracking Centre in Exchange System Manager on the Exchange server to trace the email and see where it went and why.
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plug1Commented:
Please check that PersonB does not have any delegates set up, if he does (and they can be for users who no longer exist) then this will generate said NDR's.
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clenh2oAuthor Commented:
rylandd - "Does Person B have rules in Outlook setup to forward mails to other people maybe"
I have not checked in Outlok on Person B's computer.  I will do so.  As for message tracking I have never used that function in Exchange.  I will look up how to do that and get it done and post the results.

plug1 - "Please check that PersonB does not have any delegates set up, if he does (and they can be for users who no longer exist) then this will generate said NDR's."  
In Active Directory, there ARE delegates set up for that user, however, none of them are users C or D.  However, I believe there is also a place to set delegates in Outlook (?) I may be mis-remembering.  I will check on Person B's computer and verify settings and get back with you.  

Thank you both for your repsonses.

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clenh2oAuthor Commented:
Thank you again for your response.  This was exactly right.  Person B had delegated authority to see his e-mails to Persons C and D.  I have corrected the delegate issue and the problem is resolved.
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clenh2oAuthor Commented:
To wrap this question up, plug 1 was correct, delegates existed in Person B's Outlook account.  Removing these delegates solved the issue of NDR generation.
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