Will my end-users have to update or recreate their target Outlook Profiles when their Primary Email address is updated during a domain move?
No, Microsoft Outlook will automatically detect and update their Outlook profile when their primary address is changed.
I am using the Basic Mode Email Relay Service for my domain move project. What is the best method to hold the email during the domain move and resume the delivery after the domain is moved?
I am using the Basic Mode Email Relay Service for my domain move project. What is the best method to hold the email during the domain move and resume the delivery after the domain is moved?
The easiest solution is to change your MX records from Microsoft 365 to domain that is not reachable during the domain move. For more details, please refer to this Microsoft link.
MX record change - Stop inbound mail flow
Change your primary MX record from Office 365 to domain that is not reachable, i.e. "unreachable.example.com". Internet mail servers attempting to deliver new mail will queue the mail and attempt redelivery for 24 hours. Using this method, some email may return a non-delivery report (NDR) depending on the server attempting to deliver the email. If this is a problem use an MX record backup service. There are many third-party services that will queue your email for days or weeks. Once your migration is complete, these services will deliver the queued mail to your new Office 365 organization.
Domain Move Relay Service being discontinued after Dec 31, 2025.
The Domain Move Relay Feature which automatically redirects incoming email to target user mailboxes during domain transfer process will be discontinued after Dec 31, 2025. To facilitate this change, inbound email delivery can be temporarily interrupted to facilitate the domain migration between two M365 tenants. Typically, Internet mail servers will attempt to deliver new email for up to 24 hours. Email queuing can be achieved by changing the primary MX record from the M365 tenant to an unreachable domain.
However, note that using this method may result in some email returning as non-deliverable (NDR) if the primary MX record is not promptly restored to M365. Alternatively, a third-party email queuing service can be used to queue your email for extended periods (days or weeks). Once the migration is complete, queued messages will be delivered to the target M365 tenant.
During the migration of the domain, the system will prompt for redirecting the MX record, the admin may temporarily reconfigure the mail flow by changing the primary MX record to a non-deliverable domain. By default, email will be queued and retried for up to 24 hours.
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