We have an Exchange organization that excepts email for 4 domains. We are starting to migrate one of the domains to it's own forest. We have migrated a couple of test users and all seems ok except, old emails involving the migrated users. During the migration
an X500 address is created on the new mailbox in the new forest but how are emails routed to that address from the original Forest/Domain? When replying to an old email an NDR is generated there is a legacyDN address but how can that be routed to the new Forest/Domain?
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