DNSBL


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Related to DNSBL: Spamhaus, RBL

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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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.
Policy Enforcement - Allows the network administrator to set policy supporting DNSBL, SPF, and Local Recipient Verification across the email system.
The SMTP Server receives and relays messages, using spam filtering, DNSBL, SMTP authentication, and allow/deny tables to prevent illegitimate access.