It can be anything! An apex, subdomain, or even a URL.
Results formx.usgov.email.fireeyecloud.com
www.mx.usgov.email.fireeyecloud.comusgov.email.fireeyecloud.comemail.fireeyecloud.comfireeyecloud.comcom
Registrar
Creation Date
DNSSEC
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It can be anything! An apex, subdomain, or even a URL.