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The following recipient(s) cannot be reached

I keep getting the following error despite the fact this user does not exist on active directory or distribution list.  please advise on how to correct.

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

      Subject:      Canceled: 1 - 2 - 1
      Sent:      14/06/2010 13:57

The following recipient(s) cannot be reached:

      Joe Bloggs on 14/06/2010 13:57
            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.
            <tcg.internal.change.com #5.1.1>
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Director, Information Systems
Commented:
You may need to update your offline address book.
r u sending the message to a group? if yes then you need to remove that user from the group...

Author

Commented:
The user does not exist on any group, it is permanently removed from AD.  It could be a locally cached offline address book issue.  
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_23197535.html

see the mentioned tread you may have to clear your cached add book...

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Commented:
tt