DNSBL

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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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MAPS

E-mail destined to a MailHop domain that is on a user selected DNSBL is automatically rejected.

DynDNS' MailHop Sees Major Anti-Spam Improvements by Business Wire

It uses the industry standard IP4R DNSBL format, and will work with dozens of current mail server products and anti-spam add-in programs from any platform.

Solid Oak Software Launches Email Sender Reputation Service by Business Wire

Furthermore, by adding DNSBL filtering at the message level, Praetor G2 now logs more information about the message such as the sender and intended recipient's address.

Computer Mail Services, Inc. Releases Praetor G2, Providing Multiple ... by Business Wire

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DNS pinning
DNS poisoning
DNS rebinding
DNS records
DNS server
DNS Service Discovery
DNS-SD
DNSBL
DNSSec
do
do loop
do nothing instruction
Do-Right, Dudley
do-until structure
do-while structure

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