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    Home > Exchange Online to Exchange Online Migration Process > Migration Execution > 6. (Cutover) Configure email forwarding for coexistence

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    6. (Cutover) Configure email forwarding for coexistence

    Email forwarding is needed if there are additional waves to be migrated.

    The email forwarding needs to be enabled in both source and destination:

    - Set up two-way forwarding - For all source users migrated to destination, forward from source to destination. - For all source users to be migrated to destination, forward from destination to source. - At each wave, you need to alter forwarding for those users migrated over at this wave. - This forwarding can be set before the wave starts if needed.   - Set up global contacts - Set up new email addresses in the destination for all users migrated over as global contacts in the source tenant. This is to allow calendar updates from the organizer who is already migrated to the destination tenant. - Set up all source users as global contacts in the destination tenant. This is to allow calendar updates from the organizer still in the source to attendees who are already migrated to the destination tenant.

    Forwarding Setup in Microsoft 365

    By default, Microsoft 365 will block forwarding outside the organization. To make sure forwarding is working, modify the Outbound spam filter policy in Anti-spam settings and set automatic forwarding to On to allow users to automatically forward messages outside the organization. Refer to for details.

    To set email forwarding, you can select Email forwarding in Post-migration, or use the following PowerShell command:

    Set-Mailbox -Identity user@contoso.com -DeliverToMailboxAndForward $false -ForwardingSMTPAddress "user@anothercontoso.com"

    Refer to for details.