The SBL is a realtime database of IP addresses of verified spam sources and spam operations (including spammers, spam gangs and spam support services), maintained by the Spamhaus Project team and supplied as a free service to help email administrators better manage incoming email streams.
The SBL is queriable in realtime by mail systems thoughout the Internet, allowing email administrators to identify, tag or block incoming connections from IP addresses which Spamhaus deems to be involved in the sending or origination of Unsolicited Bulk Email (aka “Spam”).
The SBL database is maintained by a dedicated international Spamhaus team based in 9 countries, working 24 hours a day, 7 days a week to list new confirmed spam issues and – just as importantly – to delist resolved issues.
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 NJABL proxy data
The XBL wholly incorporates data from two highly-trusted DNSBL sources, with tweaks by Spamhaus to maximise the data efficiency and lower False Positives. The main components are:
– the CBL (Composite Block List) from cbl.abuseat.org
– the NJABL Open Proxy IPs list from www.njabl.org.
Mail servers already using cbl.abuseat.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). Mail servers already using dnsbl.njabl.org are advised to continue doing so, as dnsbl.njabl.org is itself a composite list and contains more than the open proxy IPs list part now incorporated in XBL.
If you require any more information please feel free to contact our sales team