http://issues.apache.org/SpamAssassin/show_bug.cgi?id=5820





------- Additional Comments From [EMAIL PROTECTED]  2008-02-11 00:34 -------
zen probably should not be used in this application, and arguably nor should
XBL.  SBL is specifically a list of spam spoort spaces, (DNS, www, MX, etc.
servers).  XBL is a list of compromised hosts, mostly botnets, mostly senders,
though some fast flux web hosting also.  PBL is a list of spaces that Spamhaus
believes and ISPs specify should not be emitting mail, but could host
*legitimate nameservers, web servers, etc.*  PBL is anything but mailservers. 
(zen is a combination of SBL, XBL and PBL into a single list.)  SBL is the most
correct list to use in this test.  PBL, though zen, could FP on legitimate
nameservers, legitimate web servers, etc.

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

"The Policy Block List

The Spamhaus PBL is a DNSBL database of end-user IP address ranges which should
not be delivering unauthenticated SMTP email to any Internet mail server except
those provided for specifically by an ISP for that customer's use. [...]

The PBL lists both dynamic and static IPs, any IP which by policy (whether the
block owner's or -interim in its absence- Spamhaus' policy) should not be
sending email directly to the MX servers of third parties. [...]

Do not use PBL in filters that do any ‘deep parsing’ of Received headers, or for
other than checking IP addresses that hand off to your mailservers."



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