ietf-mxcomp
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Re: Reputation services for SenderID

2004-08-29 15:22:09

On Fri, 27 Aug 2004 19:15:31 -0400, John Leslie <john(_at_)jlc(_dot_)net> wrote:
 ...
   We then evaluate the list of IPs authorized by the SPF2 record,
and run them against known IP blacklists; accumulating a score based
on weighting the reputation of those blacklists for spam identified,
false negatives, and false positives.

This might usually work, but what do you do about the exists and ptr
mechanisms?  In general there is no practical and 100% reliable way to
produce a list of IP addresses authorized by an SPF2 record.

David