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

Results formail.trypatch.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-02-03T10:47:39.25	2025-02-03T09:49:09	2025-05-04T09:49:08	mail.trypatch.com	mail.trypatch.com	C=US, O=Let's Encrypt, CN=R10
2025-02-03T10:47:39.102	2025-02-03T09:49:09	2025-05-04T09:49:08	mail.trypatch.com	mail.trypatch.com	C=US, O=Let's Encrypt, CN=R10
2021-06-28T20:02:38.627	2021-06-28T00:00:00	2021-09-26T23:59:59	namesloth.com	mail.trypatch.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2021-06-28T20:02:37.037	2021-06-28T00:00:00	2021-09-26T23:59:59	namesloth.com	mail.trypatch.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"