During a cross forest domain migration we had to share the Exchange mailbox in both forests using the old Exchange server. This was necessary because we had migrated applications and non-migrated applications. This command will add send as permissions for the new users object to the mailbox on the old Exchange server. This command can also be used to assign permissions for a user to an Exchange mailbox.
dsacls “FQDN” /G “{Domain}\{SamAccount}:CA;Send As”
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