NDR received for user that is no longer on internal Distribution List

One of our offices had a dstribution list for all staff in that office.  Recently, one of the people from that office transferred to another office.  She was removed from the distribution list and added to the list for the new office.

When ever some one sends an email to the distribution list for her old office, they receive and NDR as Follows:

To: CN=Diane Fiorelli,CN=Users,DC=new-york\
Subject: Undeliverable: Lisa Pool is out sick today

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

      Subject:  Lisa Pool is out sick today

      Sent:     9/11/2008 8:03 AM

The following recipient(s) could not be reached:

      CN=Diane Fiorelli,CN=Users,DC=new-york\ on 9/11/2008 8:03 AM

            The message could not be delivered because the recipient's destination email system is unknown or invalid. Please check the address and try again, or contact your system administrator to verify connectivity to the email system of the recipient.

            <mail.companyname.com #5.1.2>


To test I added the user back to the distribution list.  She received the emails as she shoudl but the NDR was also generated.  I removed her from the distribution list and she stopped receiving the emails, but the NDR's continued as well.

Our domain admin noted that in the past the offices used to be their own domain, New York, Philadelphia, etc.  Now there is one domain.

How can we get rid of this "phantom" reference in the distribution list?
oweathersbyAsked:
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oweathersbyAuthor Commented:
I did a gpresult on my computer and noted the dc entry is Langan.  As I noted in origial question, The domain name used to be New York, and is now Langan.  Is the NDR being generated because of the domain name change and some property of this user is still there?
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Exchange_GeekCommented:
If you are aware of how to use LDP tool - please take a ldp dump of the user and attach it here for analysis.

Secondly, some users have a tendency to use cache information, how about if you type the DL name and check if the email goes through with / without NDR.

Thirdly, check the expansion server of that DGroup.

Please check that all DC have the same information of this user. Replication is very vital.

"One of our offices had a dstribution list for all staff in that office.  Recently, one of the people from that office transferred to another office.  She was removed from the distribution list and added to the list for the new office."


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gupnitCommented:
Hi,
Send mail via OWA and see if the mail goes properly to DG. I think it is due to Cache Address Book in Outlook clients
Please confirm
Thanks
Niitn
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Exchange_GeekCommented:
"Secondly, some users have a tendency to use cache information, how about if you type the DL name and check if the email goes through with / without NDR."

That is exactly what was hinted.


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oweathersbyAuthor Commented:
I confirmed that isis not a cached copy of the GAL being used.  I am waiting for the guys that run DNS to get the export that was requested.  Be back with you in a day.
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oweathersbyAuthor Commented:
We found an orphaned AD item in the distribution list.  An entry with no icon, but the long alphanumeric string that appears when an AD account has been removed, but that entry still has permissions to something.  We removed that and the NDR's stopped.

Thanks for your help guys
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Exchange_GeekCommented:
Wish I could have had control over your system to visually check out the DG, however im glad that this trick solved your issue.

Take Care.

Happy Troubleshooting :)
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