[Spamassassin Wiki] Update of "Rules/RCVD IN XBL" by LeeMaguire

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The following page has been changed by LeeMaguire:
http://wiki.apache.org/spamassassin/Rules/RCVD_IN_XBL

The comment on the change is:
copy description from spamhaus and add links

------------------------------------------------------------------------------
  
  The mail was received from a server listed in the [http://www.spamhaus.org/xbl/ Spamhaus Exploits Block List] [:DnsBlocklists:DNSBL], which lists hijacked PCs infected by illegal 3rd party exploits.
  
+   ''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 [http://cbl.abuseat.org cbl.abuseat.org]
+     * the NJABL Open Proxy IPs list from [http://www.njabl.org www.njabl.org].
+   ''
+ 
  === Further Info ===
  
  The default scores for this rule can be found [http://spamassassin.apache.org/tests.html in the online list of tests].