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

Results forsniper.mail.marketmatrix.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-03-01T23:48:36.051	2025-03-01T00:00:00	2026-02-28T23:59:59	sniper.mail.marketmatrix.com	sniper.mail.marketmatrix.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G2
2025-03-01T23:47:52.147	2025-03-01T00:00:00	2026-02-28T23:59:59	sniper.mail.marketmatrix.com	sniper.mail.marketmatrix.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G2
2021-01-28T12:31:45.096	2021-01-28T00:00:00	2022-01-28T23:59:59	sniper.mail.marketmatrix.com	sniper.mail.marketmatrix.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1