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In short, use a different service provider. Bravenet have targetted a partcular niche for message boards which is open access.
Browser: Firefox3.6.12
OS: XP
look at proboards phpbb style message boards you need those for what you want. Where the person has to be logged in with a username/pw to see the board and or post. Some you can't even see the board unless logged in. Other boards you can see the posts etc but to be able to reply and things you have to have a username/pw So do a google search of message forums and look for the type mentioned.