Re: SPF Prior Art?

On Sep 23, 2004, at 00:45, Hector Santos wrote:

> Correct,  it would not be difficult to prove prior art and upon examination
> using the Markush-type patent analysis, it would be difficult to enforce the
> broad claims in this MS patent application.
>
> Prior Art existed for MAIL FROM checks for years now.  Besides, RFC 2821
> Section 3.3 "Mail Transactions clearly opens the door for MAIL FROM
> validation possibilities:

Hector,

I am glad that you agree. Now the question is: how do we get the USPTO to examine this line of thought to disallow the MS patents. Furthermore, at the IETF F2F in San Diego, Pete Resnick offered to describe his reasoning behind the various SMTP headers. He contended that this would invalidate the PRA algorithm by prior art demonstration.

Andrew

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Andrew W. Donoho
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