On Wed, 5 Mar 2003, Clifton Royston wrote:
People might want to look at the recently-implemented Postfix
sender verification feature in current snapshot releases.
This technique is patented and assigned to ESCOM Corporation, in US
Patent #6,321,267 (see the section "Active User Testing")
The patent was filed 23 November 1999; if you think you have prior
art, I encourage you to publish it.
--
David.
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