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

Results formail1.rubyengagementring.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-11-18T03:01:15.465	2025-11-18T02:02:43	2026-02-16T02:02:42	mail1.rubyengagementring.com	mail1.rubyengagementring.com	C=US, O=Let's Encrypt, CN=R12
2025-11-18T03:01:13.233	2025-11-18T02:02:43	2026-02-16T02:02:42	mail1.rubyengagementring.com	mail1.rubyengagementring.com	C=US, O=Let's Encrypt, CN=R12
2025-08-26T08:21:46.752	2025-08-26T07:23:16	2025-11-24T07:23:15	mail1.rubyengagementring.com	mail1.rubyengagementring.com	C=US, O=Let's Encrypt, CN=R13
2025-08-26T08:21:46.33	2025-08-26T07:23:16	2025-11-24T07:23:15	mail1.rubyengagementring.com	mail1.rubyengagementring.com	C=US, O=Let's Encrypt, CN=R13