(Realtime Blackhole List) A list of the IP addresses of known spammers. See MAPS.
"RBL." YourDictionary, n.d. Web. 12 October 2018. <http://www.yourdictionary.com/rbl>.
RBL. (n.d.). Retrieved October 12th, 2018, from http://www.yourdictionary.com/rbl
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