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.
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