Require users to introduce themselves in introduction thread.

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I've a forum where I programatically insert users (so filling out introduction during registration is out of the question) and the guys are participating, but they are not introducing themselves. I'd like to make it mandatory that new users introduce themselves if they want to post.

Sort of like... Your must introduce yourself in the introductions thread before you're allows to post.

Is there a mod that can do this or can this be done without a mod?