A user registers, after that they must confirm their email adres. After confirmation the admin receives an email to confirm the account.
Here is what I would do:
First, you can simply change the user role to require email activation. If the user has a valid email, he will confirm the registration. However, by default the user account is not active yet but pending admin review. You’ll get an email that will alert you to the fact that there is a new user that is updating his/her membership status on your site.
You’ll review the user profile page and if you approve, you’ll simply click on the edit icon and activate his account.
The only thing that would really be different is that, even if the user doesn’t validate his registration, you will be alerted by email regardless.
Would this scheme work for you?
That can be done. I’m not sure an add-on is necessary, but it would require a bit of time and you know what that means. ??