Best way to implement a more complex user registration/auth flow?

I'm currently using django.contrib.auth for my user authentication which works well for simple authentication/authorization but I'd like to expand the registration/auth flow a little. 

Right now with the default flow users go to the signup page, signup, then are redirected to the login page and can immediately sign in. Id like to have it so that once the new user signs up they are sent an email confirmation. Once they confirm their email their account is flagged inactive so they cant login until a site administrator, who receives a notification email once they confirm, flags their account as active. Once the administrator flags their account as active the user gets another email saying their account is approved and they can login.

Is there a library out there that can help me build this so that I dont have to build everything myself ontop of the django auth? Thanks

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