Fighting malware and spam

DNSBL

List of known-bad (malicious) email servers on the web

A DNSBL is a list of the IP addresses of known-bad servers, generally spamming email servers. Such lists are made available for spam-blocking software to query in real time, so that unknown addresses requesting connections can be checked before they are granted access.

The technology for operating a DNSBL is fairly simple and there are a variety of such lists provided and maintained by many different organisations, as well as several variations on the same theme. Prominent examples include SpamCop Spamhaus, and others.

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