Notify about New Members to Multiple Users via PM or E-mail
 

Is there a hack that does one or either or both of the following:

1. Upon user registration, notify multiple e-mail addresses of a new user registration. The current system only sends an e-mail notification to a single e-mail address specified in the "Notify about New Users" section

2. Upon user registration, notify multiple admins of a new user registration via the Private Messaging system

Does anyone have any ideas how I can do the above?