protect lists

We are using tools jx to create mailing lists of our members which has worked out great! However, all of the access is either superadmin or registered. But google has indexed our lists using a url and they are not protected! Our menu item is protected, but how can we make our lists for registered users ONLY. I have edited the robots txt to disallow components/grid and /mailings/ (the sef url of the lists)

This is very important and i need to fix asap.

Thank you!