DNS blacklists

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Revision as of 18:59, 20 May 2008 by Johnl (talk | contribs) (New page: {{ast |date=about 1997 |difficult=Medium |popular=High |effective=High to Low |harm=Low to High |where=MTA }} DNS blacklists publish lists of IP addresses that share an undesirable charact...)
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Anti-spam technique: DNS blacklists
Date of first use: about 1997
Effectiveness: High to Low
Popularity: High
Difficulty of implementation: Medium
Where implemented: MTA
Harm: Low to High

DNS blacklists publish lists of IP addresses that share an undesirable characteristic. The characteristic is most often a history of sending spam, but lists also exist that include IP addresses whose owners assert they shouldn't be sending mail, addresses in a geographic region, hosts that are believed not to conform to relevant RFCs, and a wide range of other criteria.

The technical operation of DNSBLs is decribed at Description_of_DNSBLs.