thank you david, in fact I was talking about the mail we receive when a person registers by paying, we have a mail indicating the price, and the client an invoice. I would like to receive an email as admin) to tell me that a person signs up for free.
What is the purpose of such modifications? Next version will have manually approve new users functionality, when user will signup his account will not be approved and admin will receive notification about signup. I guess this is what you need?
In fact, the person to be validated, that's fine, but if we could get an e-mail to report the free registration, it allows us to track people who register