I have removed the description of Receiver Initiated Authentication as I have developed a markedly superior alternate system based on an entirely different principle that promises to universally and transparently authenticate both the mail transfer agents and personal computers used to send email. This new system will also allow for the elimination of CAPTCHA (yes, even the 3-D CAPTCHA that I invented). I intend to place a detailed overview of this unique system on this page within a couple of months.
Michael G. Kaplan
April 27, 2009