Right now when someone signs up for the forum they can put a random fake email and post. It would be good to do like most other forums and make new members have to sign in to their email and click a verification link. This could make it easier to track people that post attacks on the forum.
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The board is set to use an activation email. Are you sure you can log in without activating?
You can login, but not post without activating an account, I believe.
It doesn't deter some people though, if someone has nothing else to do they can signup legitimate accounts and post.