From page 54 of the PAR Administrator manual:
"If Manual is selected then the primary contact e-mail at the system level will receive an email when it is time to manually reset the password. The contact will keep receiving this email at regular intervals based on how this is configured by the Sys-Admin in the Auto Management Agent settings, until the password has been confirmed to be reset in PAR."
The same will not apply if the password is set to reset automatically. Then the notification will go out after the reset has taken place. To receive an email notifying that the change is due, set the Password Management option to "Manual".