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

Results forwebmail.bbtechsolution.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-10-08T07:11:52.587	2019-10-08T00:00:00	2020-01-06T23:59:59	bbtechsolution.com	webmail.bbtechsolution.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2019-10-08T07:11:40.021	2019-10-08T00:00:00	2020-01-06T23:59:59	bbtechsolution.com	webmail.bbtechsolution.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2019-09-05T04:41:24.701	2019-09-05T00:00:00	2019-12-04T23:59:59	bbtechsolution.com	webmail.bbtechsolution.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2019-09-05T04:40:55.076	2019-09-05T00:00:00	2019-12-04T23:59:59	bbtechsolution.com	webmail.bbtechsolution.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"