Email on waiting for confirmation.
After registering the new visitor gets an email stating the he has been added to the users waiting for authorization group.
This is how I have my emails set and what my test user account received:
"
Hello ihhahcnsd,
It appears your user group has been changed to Users Awaiting Email Confirmation.
If you believe this to be an error please contact one of the Administrators at politicalforums.net
Thanks!"