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

Results formail.themindsetcollection.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-05-19T11:48:51.383	2019-05-19T10:48:50	2019-08-17T10:48:50	tjsimamuye.com	*.themindsetcollection.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-05-19T11:48:50.454	2019-05-19T10:48:50	2019-08-17T10:48:50	tjsimamuye.com	*.themindsetcollection.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-01-21T21:49:33.835	2019-01-21T20:49:32	2019-04-21T20:49:32	themindsetcollection.com	*.themindsetcollection.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-01-21T21:49:32.518	2019-01-21T20:49:32	2019-04-21T20:49:32	themindsetcollection.com	*.themindsetcollection.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-07-04T06:11:09.808	2018-07-04T05:11:09	2018-10-02T05:11:09	mapsetting.com	mail.themindsetcollection.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-07-04T06:11:09.327	2018-07-04T05:11:09	2018-10-02T05:11:09	mapsetting.com	mail.themindsetcollection.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3