It can be anything! An apex, subdomain, or even a URL.

Results foremail.mg.profitableproperties.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-03-09T04:13:02.053	2025-03-09T03:14:29	2025-06-07T03:14:28	email.mg.profitableproperties.com	email.mg.profitableproperties.com	C=US, O=Let's Encrypt, CN=E6
2025-03-09T04:12:59.183	2025-03-09T03:14:29	2025-06-07T03:14:28	email.mg.profitableproperties.com	email.mg.profitableproperties.com	C=US, O=Let's Encrypt, CN=E6
2025-02-25T03:59:58.668	2025-02-25T03:01:27	2025-05-26T03:01:26	email.mg.profitableproperties.com	email.mg.profitableproperties.com	C=US, O=Let's Encrypt, CN=E6
2025-02-25T03:59:58.225	2025-02-25T03:01:27	2025-05-26T03:01:26	email.mg.profitableproperties.com	email.mg.profitableproperties.com	C=US, O=Let's Encrypt, CN=E6