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

Results formail2.rubyengagementring.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-11-11T05:22:16.215	2025-11-11T04:23:45	2026-02-09T04:23:44	mail2.rubyengagementring.com	mail2.rubyengagementring.com	C=US, O=Let's Encrypt, CN=R12
2025-11-11T05:22:16.053	2025-11-11T04:23:45	2026-02-09T04:23:44	mail2.rubyengagementring.com	mail2.rubyengagementring.com	C=US, O=Let's Encrypt, CN=R12
2025-08-20T04:08:52.118	2025-08-20T03:10:21	2025-11-18T03:10:20	mail2.rubyengagementring.com	mail2.rubyengagementring.com	C=US, O=Let's Encrypt, CN=R10
2025-08-20T04:08:51.882	2025-08-20T03:10:21	2025-11-18T03:10:20	mail2.rubyengagementring.com	mail2.rubyengagementring.com	C=US, O=Let's Encrypt, CN=R10