Not "exactly" the same, however Spamhaus uses the CBL zone exclusively to create the XBL zone.  It is likely that Spamhaus cleans the zone a bit prior to publishing.  Their site describes how the data is sourced:

    http://www.spamhaus.org/xbl/index.lasso

Note that the 127.0.0.6 result code refers to the integration of Blitzed tests, while 127.0.0.4 is the CBL data.

Matt



Markus Gufler wrote:
Do you mean "xbl.spamhaus.org" if so according to Declude's list "...This contains the same data as the CBL test..." 
 
From 05/01/04 on our server has processed 183721 messages.
 
In this time range CBL has helped to catch 54948 spam messages by having also a false positive result for 481 legit messages.
In the same time range XBL has helped to catch 52163 spam messages by having also a false positive result for 68 legit messages.
 
So if I don't miss something it's not exactly the same.
 
Markus
 
 

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