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Some newsgroups insist that the discussion remain focused and on-target; to serve this need, moderated groups came to be. All articles posted to a moderated group get mailed to the group's moderator. He or she periodically (hopefully sooner than later) reviews the posts, and then either posts them individually to Usenet, or posts a composite digest of the articles for the past day or two. This is how many mailing list gateways work (for example, the Risks Digest).
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