Map from registrar email / name to detected subdomain threats:
{"threatMatches":[{"threatType":"MALWARE","fullyQualifiedDomainName":"a.com"}],"registrarClientId":"TheRegistrar","registrarEmailAddress":"the.registrar@example.com"}
{"threatMatches":[{"threatType":"MALWARE","fullyQualifiedDomainName":"b.com"},{"threatType":"MALWARE","fullyQualifiedDomainName":"c.com"}],"registrarClientId":"NewRegistrar","registrarEmailAddress":"new.registrar@example.com"}
