Topic on All The Tropes talk:How We Do Bans Around Here
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It occurs to me that we should probably lay out explicitly the bans for spam somewhere, too. Our current procedures are permanent ban for a registered account which spams, and a six-month or one-year tempban on an anonymous IP. (I've used both one-year and permanent bans on IPs that have any results at all on StopForumSpam.com's IP Check, which generally means they're IPs owned by spammers.)