Add an MX entry in cPanel
(An MX Record is used by a mail server to route incoming email. Changing your MX record is usually done to redirect email to a remote server. It can also be used as a temporary backup email server).
Click on “Zone Editor” icon at Domain area.
Selete “CNAME” in Filter.
Click “Add Record” or “Edit” or “Delete” to manage the MX records.