Composite Blocking List

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In computer networking, the Composite Blocking List (CBL) is a DNS-based Blackhole List of suspected E-mail spam senders.

The CBL takes its source data from very large spamtraps/mail infrastructures, and only lists IPs exhibiting characteristics such as:

  • Open proxies of various sorts (HTTP, socks, AnalogX, wingate etc)
  • Worms/viruses that do their own direct mail transmission
  • Trojan horse or "stealth" spamware, without doing open proxy tests of any kind.
  • Misconfigured mail servers (for example, servers that send HELO with 'localhost' or a similar incorrect domain.)

Entries automatically expire after a period of time.

The CBL does not provide public access to gathered evidence.

CBL data are used in Spamhaus XBL list.

See also

External links

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