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Yes, you may remove the Global Administrator role from the admin account after the project is configured. Note, If Domain Move Migration is in-scope of the project, the Global Administrator role must be added back to the account during an active domain move as it is required to remove the domain from the source tenant and add it to the target tenant.
When planning the deployment of Domain Rewrite Service we recommend the following regarding Sender Policy Framework (SPF) records:
Update your existing SPF record to include the On Demand Migration Domain Rewrite list of acceptable domains. This will prevent any hard failures when routing mail through the Rewrite Relay Service.
Include the following domain with your SPF record from all source and target domains participating in Domain Rewrite:
Important Tip: Do not plan on utilizing the default “tenant.onmicrosoft.com” domain when deploying On Demand Migration Domain Rewrite Services. This is due to concerns regarding the external recipient domain's having SPF hard fail enabled.
Administrators can confirm if the message has been processed by Domain Rewrite Service by submitting a message trace in Microsoft 365 admin portal or review the message header.
Administrators may verify the configurations from the Microsoft 365 Exchange Online Administrator Portal.
To verify by portal, simply login to the Exchange Online Admin Portal. Then navigate to Mail Flow. Under Mail Flow you will find the rules and connectors like the ones show below.