If you are an admin, go to your personal settings, point "E-mail notification" and activate at least "once a new user has signed up". You'll get an email in the future, when a visitor registers him-/herself.

This works OK, and resolves one side of the problem. Maybe this particular setting should be a default? I know there are pros and cons...

The unlocked user should anyway get the notification. But you said you work on this.

So, thanks again .