Action: Inside of G Suite 'Add another domain' and verify that domain inside of G suite. This will be used to support staged ...

Action: Inside of G Suite 'Add another domain' and verify that domain inside of G suite. This will be used to support staged mailflow migration and auto-forwarding from Office 365 to G Sutie.  Use a subdomain from the primary SMTP (example: pilot.contoso.com)   The MX for the subdomain will point to G suite and we will use this subdomain to route mail back to active G suite mailboxes during email co-existence.  The subdomain should NOT be validated in Office 365.  (NOTE: for secondary domains it may be neccessary in G Suite to add the pilot.contoso.com domain using the Google API method. Work with your FastTrack Engineer for the Gmail_Migration_Plan documentation on these detailed migration steps.