I found the qa_users database table that at least lists the registered users. The "Users" tab I see when I login to localhost does not list any registered users as far as I can tell.
As for e-mail, at least it is working for you even if it is slow. So far no one gets notified with my installation. I just get script errors that I found listed in another post where an answer just explained that on some sites, mail just doesn't work. I must have one of those sites.