bbPress.org

rashantha-just tackled this one earlier in the week. Check out, https://trac.bbpress.org/ticket/633

Spam is really an issue, not sure how to solve it. 20 minutes after I set it up I received my first spamming. Maybe you make users fill out a verification number before they can post. Don’t know if any such solution exists. Another option is to get a plugin, name escapes me that makes it so posts must be approved.

Matt