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

Results formail.pk.webitechhost.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-02-12T01:39:15.073	2019-02-12T00:00:00	2019-05-13T23:59:59	pk.webitech.com	mail.pk.webitechhost.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2019-02-12T01:39:00.942	2019-02-12T00:00:00	2019-05-13T23:59:59	pk.webitech.com	mail.pk.webitechhost.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2018-11-28T01:38:00.169	2018-11-28T00:00:00	2019-02-26T23:59:59	pk.webitech.com	mail.pk.webitechhost.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2018-11-28T01:37:41.518	2018-11-28T00:00:00	2019-02-26T23:59:59	pk.webitech.com	mail.pk.webitechhost.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2018-09-13T00:40:33.592	2018-09-13T00:00:00	2018-12-12T23:59:59	webitech.pk	mail.pk.webitechhost.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2018-09-13T00:40:14.577	2018-09-13T00:00:00	2018-12-12T23:59:59	webitech.pk	mail.pk.webitechhost.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"