No mail notification upon completed request

Hi On-screen messages etc are shown when a course is completed, with a possibility to view/download certificate. But the server doesn't send any notifications, for instance with an attachments of the certificate. I would gather this should be possible? There's a default rule; /admin/config/workflow/rules/reaction/manage/rules_check_user_completed_course Gather it is this rule that reacts on passing, whether a quiz, or lesson? I cannot see any action on mail notification. Rgds Knut