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i think you just activate "Require Approval" setting from jomsocial multi profiles.. i tried to register on your site as "Test01" (choose profile number 1) and at the end of registration page i got this message "Your account has been created and is still under moderation. Until the site administrator approves your account, you will not be able to login. Once your account has been approved, you will receive a notification email."
That's why you got an email about approve registration.. :) Please check again your settings and could you provide me your backend access as super user if you need some assistance