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Domain footprint: flagstar.com
Resolved live just now — where this domain's services actually run, with each address attributed by OrgIndex. A DNS observation, not registry data: many organisations run entirely on providers' networks and hold no IP space of their own.
Mail:
flagstar-com.mail.protection.outlook.com → Microsoft Corporation
SPF sends via:
spf.protection.outlook.com · spf.cashedge.com · externalmail.flagstar.com · everbridge.net · cust-spf.exacttarget.com · sendgrid.net