Migrated users receive NDRs for messages that were received (924234)

SYMPTOMS

A user is migrated from one Exchange organization to another using the Qwest Migration Tool--there may be other products which cause this issue, including Microsoft solutions, but they have not been verified--people sending to that user receive a large number of non-deliver reports like the following:

From: System Administrator
Sent: Monday, February 06, 2006 3:12 PM
To: user.name@private.domain
Subject: Undeliverable: test

Your message did not reach some or all of the intended recipients.
      Subject:  test
      Sent:     2/6/2006 1:58 PM

The following recipient(s) could not be reached:
      user.name@private.domain on 2/6/2006 3:12 PM
            No route was found for the recipient server.  Please contact your 
system administrator.  The MTS-ID of the original message is:c=US;a= 
;p=Contoso;l=MAILSRV010602062058150258
            <mailsrv01.corp.contoso.com #5.4.4>

"user.name@private.domain" is the address stamped on the user in both the source and destination organizations to allow communication between current and former mail environments while mailboxes are being moved.

CAUSE

The migration tool creates a new user account and mailbox in the destination system and copies most of the Active Directory properties from the source account to the newly-created account. One of these properties is "deliverAndRedirect," which corresponds to the "Keep a copy of the message in this mailbox" checkbox in a user object's properties. However, because the mailbox created is a stub and the corresponding target address attribute is not copied, messages with a blank destination address are created, which causes unexpected results in Exchange. The "Keep a copy..." checkbox cannot be cleared as it is disabled in the user interface.

RESOLUTION

To resolve the issue:

Set the deliverAndRedirect attribute to false in ADSIEdit
or
Enter some text into the forwarding address textbox to enable the "Keep a copy..." checkbox.
Clear the checkbox.
Clear the preceeding textbox.

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