Admin is listed as recipient for a number of system emails. The email will actually go to all the admins where applicable. For example:
"New Job To Admin"
goes to "All Admin Users and Junior Admins (if applicable)". This means that Admin (all admins) will get this email. Also, if there are any junior admins, who are assigned to that client account, they will also receive the email.
"Status Update / Message Notification"
also goes to admin and junior admins, if the junior admin is assigned to that account.