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Re: Problem with SID

2005-06-21 08:31:10
On Tue, 21 Jun 2005, David MacQuigg wrote:

It would help if someone could provide a clear, concise statement of the 
PRA/SPF problem and post it on the new website.  I'll help with the wording 
to make sure it is clear to non-experts.

SPF classic validates the MAIL FROM identity defined in RFC2821 by 
describing which IP addresses a given MAIL FROM can originate from.
Sender-ID validates a new identity defined by Microsoft called "PRA" which is
derived from identities defined in RFC2822 via a patented algorithm.

This would be an interesting and valuable experiment on Microsoft's part,
except for this: they propose to reinterpret, in production across their
entire 90% market share user base, the million or so SPF classic
records describing IPs valid for a MAIL FROM as if they instead described
IPs valid for a PRA.  This turns their interesting experiment into
electronic vandalism on a global scale.

-- 
              Stuart D. Gathman <stuart(_at_)bmsi(_dot_)com>
    Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flamis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.


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