(Realtime Blackhole List) A list of the IP addresses of known spammers. See MAPS.
"RBL." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/rbl>.
RBL. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/rbl
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