Composite Blocking List
In computer networking, the Composite Blocking List is a DNS-based Blackhole List of suspected E-mail spam sending computer infections.Overview
The CBL takes its source data from very large spamtraps/mail infrastructures, and only lists IPs exhibiting characteristics such as:
The CBL attempts to avoid listing real mail servers, but certain misconfigurations of mail servers can make the system appear infected
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.
