Since the source domain or tenant will be shut down, using source contacts post migration is not the recommended solution.
Follow the steps listed in our online help for a Domain cutover, specifically step 5.
During Step 5, the DNS administrator of the Domain being moved will execute an update to their public DNS MX record to direct traffic to the Exchange Online Protection (EOP) (e.g. contoso-com.mail.protection.outlook.como) or another relay service.
After this step is complete, all inbound mail from the Internet for the domain being moved will be routed to the new destination tenant. Power365 ERS relays will no longer be used.
Please contact your sales account manager or sales (sales@quest.com) if you require assistance from Quest Software regarding your Domain Cutover
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