The globar root URL is fine.
I have tried registering, but no, - no email.
What have you put as the 'from' address(es) in the globals file? If it isn't already, make sure it is an address from site domain, i.e: website (at) aaawebclass.org or registration (at) aaawebclass.org - just to test if the server is restricting mail to addresses from its own domain. (It doesn't have to exist).