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Spamhaus Exploits Block List
The Spamhaus Exploits Block List (XBL) is a realtime database of IP addresses of illegal 3rd party exploits, including open proxies (HTTP, socks, AnalogX, wingate, etc), worms/viruses with built-in spam engines, and other types of trojan-horse exploits.
Incorporates CBL data and OPM data
The XBL wholly incorporates data from two highly-trusted DNSBLs, the CBL (Composite Block List) from cbl.abuseat.org, and the Blitzed Open Proxy Monitor from opm.blitzed.org, therefore mail servers already using cbl.abuseat.org and opm.blitzed.org should NOT also use xbl.spamhaus.org or you will be making 'double' queries to basically the same data source and only one DNSBL will appear to work, the other(s) will appear to not catch anything. For additional FAQs and information on the CBL see http://cbl.abuseat.org/. For information on OPM see http://opm.blitzed.org/info