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

Results forwebmail.edu.alegroups.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-09-10T14:42:12.988	2020-09-10T00:00:00	2020-12-09T23:59:59	edu.alegroups.com	webmail.edu.alegroups.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2020-09-10T14:42:12.697	2020-09-10T00:00:00	2020-12-09T23:59:59	edu.alegroups.com	webmail.edu.alegroups.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2020-06-26T18:35:04.263	2020-06-26T00:00:00	2020-09-24T23:59:59	edu.alegroups.com	webmail.edu.alegroups.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2020-06-26T18:35:03.958	2020-06-26T00:00:00	2020-09-24T23:59:59	edu.alegroups.com	webmail.edu.alegroups.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"