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

Results for*.mail.classicaldeal.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-05-26T15:28:09.194	2019-05-26T14:28:08	2019-08-24T14:28:08	classicaldeal.com	*.mail.classicaldeal.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-05-26T15:28:09.194	2019-05-26T14:28:08	2019-08-24T14:28:08	classicaldeal.com	*.mail.classicaldeal.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-05-26T15:28:08.805	2019-05-26T14:28:08	2019-08-24T14:28:08	classicaldeal.com	*.mail.classicaldeal.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-05-26T15:28:08.805	2019-05-26T14:28:08	2019-08-24T14:28:08	classicaldeal.com	*.mail.classicaldeal.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-29T10:54:04.058	2019-03-29T09:54:03	2019-06-27T09:54:03	classicaldeal.com	*.mail.classicaldeal.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-29T10:54:04.058	2019-03-29T09:54:03	2019-06-27T09:54:03	classicaldeal.com	*.mail.classicaldeal.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-29T10:54:03.157	2019-03-29T09:54:03	2019-06-27T09:54:03	classicaldeal.com	*.mail.classicaldeal.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-29T10:54:03.157	2019-03-29T09:54:03	2019-06-27T09:54:03	classicaldeal.com	*.mail.classicaldeal.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3