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DNSBL
(redirected from Realtime Blackhole List)

    Also found in: Wikipedia 0.04 sec.

DNSBL

(DNS BlackList or DNS Blackhole List) A system for identifying spammers based on their IP addresses. Most mail servers are able to query a DNSBL to determine if a specific IP address is on the list. The MAPS Real-time Blackhole List (MAPS RBL) was the first DNSBL, but was initially not in the DNSBL format.

DNSBL Policies
There is no uniformity in the way DNSBL providers operate. Candidates for the list may be supplied by users or only from sources that have proven the IP address is from a spammer. Some DNSBL providers list only IP addresses, while others list only open relays and open proxies (see open relay and open proxy server). The policies also differ as to how long a listing lasts and how it can be removed. See MAPS.



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Users can custom configure a list of Realtime Blackhole List servers to query, so known spam sources can be instantly cut off.
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Take all this energy devoted now to things like the Realtime Blackhole List and turn it to the creative process of tracking down spammers.
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The company was already using a combination of solutions to protect itself from spam including Realtime Blackhole Lists (RBLs).
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