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Domain footprint: hmhs.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:
mailgate.highmark.com → Highmark Inc
SPF sends via:
spf.protection.outlook.com
Separately, 4 organisations whose name resembles “hmhs.com” — these may be unrelated to the domain above.