ROKSOAcronym for Register of Known Spam Operations, a free-access public register of spam operations that have been thrown off of at least three ISPs for their spamming activities. ISPs do not throw off suspected spammers without warning and giving the outfits a chance to stop their activities. ROKSO's rationale is that any organization that has been thrown off three or more ISPs for spamming are considered "hard-line" spammers who have signed onto an ISP with the intention of breaking the ISP's Terms of Service -- most ISPs have regulations that specifically state that known spamming will not be tolerated. ROKSO is maintained by The Spamhaus Project, an organization that works with ISPs to identify and remove spammers from the Internet.
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