The three basic components that make up a DNS Blacklist - a domain name to host it under, a server to host that domain, and a list of addresses to publish to the list - also haven't changed from the time when the RBL was first created to today. In fact, almost all of today's email servers support at least one DNSBL in order to reduce the amount of junk mail clients using their service receive. Although modern DNS Blacklists are rarely used as educational tools, their function as an email blocker and filter still serves as their primary purpose to this day. Called the RBL, its purpose was to block spam email and to educate Internet service providers and other websites about spam and its related problems. If the maintainer of a DNS Blacklist has in the past received spam of any kind from a specific domain name, that server would be "blacklisted" and all messages sent from it would be either flagged or rejected from all sites that use that specific list.ĭNS Blacklists have a rather long history in web terms, with the first one being created in 1997. As their name implies, the lists are based on the Internet's Domain Name System, which converts complicated, numerical IP address such as 66.171.248.182 into domain names like, making the lists much easier to read, use, and search. Domain Name System Blacklists, also known as DNSBL's or DNS Blacklists, are spam blocking lists that allow a website administrator to block messages from specific systems that have a history of sending spam.
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