DNS blacklists
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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.
