DNSbl - SpamCop Dictionary

Adapted from the Forum SpamCop Glossary

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DNSbl		DNS based blocking system. A DNS server keeps track of I.P.s that meet the listing service's criteria. Also known as BLOCKING LISTS and BLACKHOLE lists. Mail servers and other network servers can reference them to reject mail or connections, or to decided if they need to examine them further. They also can be used to indicate trusted I.P. addresses to accept mail or connections. There are many DNSbls with different criteria. The spamcop.net DNSbl lists I.P. addresses that spam has been reported to originate from. It is aggressive, and may list real mail servers. Some list only I.P. addresses that have been shown to be compromised and abused by spammers. Others list I.P. addresses that are known to be controlled by spammers. These are known as conservative DNSbls. And some list I.P. addresses that are DHCP assigned. These are known as Dyanmic list and sometimes DIALUP lists. Many mail servers will not accept e-mail from these addresses. There are also DNSbls that list all I.P. addresses for specific ISP's and countries. Use of conservative DNSbls can block over 80% of the incoming spam usually with out any real e-mail being rejected unless the sender's mail server has a severe security problem. Adding a good DHCP blocking list to that can eliminate most of the remaining spam with a very small chance of rejecting a real e-mail. An aggressive DNSbl can be used to indicate if additional tests should be done on an incoming e-mail to see if it is spam or real e-mail. Also see rDNS
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Additional Sources for Glossary Information
The SpamCop Glossary is being limited to terms used within the SpamCop Forums. The following additional links provide far more information which may both help to better explain terms defined in the SpamCop Glossary as well as many more terms not included here. They are listed in no particular order.

NetLingo - The Internet Dictionary
NetLingo contains thousands of definitions that easily explain the Internet and the online world of business, technology, and communication. Updated weekly with new terms, NetLingo is (currently) ranked #656 in Google's Top 1000 Web sites and reviewed in many publications.
Our mission is to educate and entertain you, and keep you up-to-date.

The Jargon File
The Jargon File is a comprehensive compendium of hacker slang illuminating many aspects of hackish tradition, folklore, and humor.

Wiktionary
Wiktionary is a sister project to Wikipedia intended to be a free wiki dictionary (including thesaurus and lexicon) in every language.
Wiktionary serves to:

• explain the meanings of words, terms and abbreviations
• translate words from one language to another
• act as a thesaurus by showing synonyms

Contributors:
WB8TYW (aka John)
Wazoo
turetzsr (aka Steve T)
StevenUnderwood (aka Steven P. Underwood, DNRC)
qjvgpuryy (aka David)
Miss Betsy
Lking
Larry Kilgallen (ng member)
Jeff G.
Jank1887
dbiel