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Composite Blocking List

The CBL takes its source data from very large spamtraps/mail infrastructures, and only lists IPs exhibiting characteristics which are specific to open proxies of various sorts (HTTP, socks, AnalogX, wingate etc) and dedicated Spam BOTs which have been abused to send spam, worms/viruses that do their own direct mail transmission, or some types of trojan-horse or "stealth" spamware, dictionary mail harvesters etc.

NEW! The CBL also lists certain portions of SpamBot infrastructure, such as Spam BOT/virus infector download web sites, and other web sites or name servers exclusively dedicated to the use of Spam BOTs. Considerable care is taken to avoid listing IP addresses that have are or are likely to be shared with legitimate use, except in the case of infector download websites.

In other words, the CBL only lists IPs that have attempted email connections to one of our servers in such a way as to indicate that the sending IP is infected, OR, IPs specifically dedicated to the propagation/use of Spam BOTs.

The CBL does NO probes. In other words, the CBL NEVER makes connections to other machines to "test" anything.

The CBL does NOT test for nor list open SMTP relays.

The CBL only lists individual IPs, it NEVER lists ranges.

The CBL does NOT care whether an IP is dynamic or not, if connections the IP makes indicate that it's infected, it is listed regardless.

The CBL does NOT attempt to associate IP addresses to persons or organizations, and furthermore, a CBL listing should NOT be construed as accusing anyone of spamming - virtually all listees are the victims of a virus or other compromise, not deliberately spamming.

The CBL does NOT accept external submissions for listing. Hence it is not possible for the CBL to be used as an instrument of revenge (eg: "disgruntled ex-employee" or "competitor").

The CBL operates in an entirely automated way designed to avoid listi

Technical Details

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If any information concerning this DNSBL is incorrect, missing, or out of date, please contact us.