---------- Forwarded message ---------- Date: Tue, 18 May 2004 00:20:39 -0400 From: Meng Weng Wong Reply-To: spf-discuss@v2.listbox.com To: spf-discuss@v2.listbox.com Subject: Re: [spf-discuss] regarding hashcash / penny black and vanquish On a related note regarding the sender-pays concept, I was recently approached by www.vanquish.com. The concept is similar to Yahoo DomainKeys --- ISP-level cryptographic signatures embedded invisibly in the message --- but adds an interesting twist: along with the signature you get a microbond. Not a micropayment, where each delivery always represents a financial transaction; more like a microbet, where each delivery is underwritten by a willingness to pay. Essentially, senders say "I bet you 1 cent that my message won't waste your time." If the message is legit, the recipient doesn't collect. Only if it's spam does the recipient make the sender pay. I think this model accurately reflects real-world economics. Their business challenge is twofold: getting their zero-value bond (in signature only mode) out into the market before Yahoo DomainKeys hits the bigtime, and finding the industry niche who actually do want to make use of this concept. The great thing about sender authentication is that once it's in place, you can start augmenting the email landscape in all kinds of interesting ways like this one. ------- Sender Policy Framework: http://spf.pobox.com/ Archives at http://archives.listbox.com/spf-discuss/current/ Latest draft at http://spf.pobox.com/spf-draft-200405.txtsc Wiki: http://spfwiki.infinitepenguins.net/pmwiki.php/SenderPermittedFrom/