Exchange Migrator 2.x
Getting an NDR (Not Deliverable Receipt) message: "The message could not be redirected to an alternate-recipient because that recipient had previously redirected the message."
The source mailbox lists itself as alternate recipient. This happens if Exchange Migrator was querying several target DCs during the migration process.
This issue was addressed in Exchange Migrator 2.3 Hotfix EM23000_Hotfix39487. Download the current Exchange Migrator 2.3 Hotfix from the following location:
Exchange Migrator Hotfixes - https://www.netiq.com/support/em/hotfixes.asp