I agree with @chouf1 this is a violation of your users privacy. You as an admin already have access to this info and publicly displaying this info is a violation of user privacy and very irresponsible, and it will welcome a potential lawsuit if it is not implicitly stated in your privacy policy that the users email address will be public access. I would strongly advise you to reconsider and perhaps consult an attorney before you ever do such a thing. If you do its on you my friend. Sorry, but that is your safest bet.
