As more people sign up to the walled garden the odds that some of them will be p0wned by spammers increases, and at some point the spammers will add code to detect and use the walled garden. At that point it gets interesting, because even at 1c/email a couple of thousand emails going out from your computer is going to be enough to disconcert you. Especially when it happens every day until you manage to disinfect your computer. Better hope McAfee is on the ball.

For a large company with thousands of computers (and a correspondingly large volume of legitimate walled garden traffic) a single day of infection could cost the walled garden an awful lot of credibility (and customers), because they will be able to hit every single customer multiple times. It’s likely that spammers will regard the walled garden as a desirable market, and if the garden works well enough for people not to filter it we could see spamming techniques rolled back to the very early days when spam read like junk mail rather then being designed to get through filters.

“The only question is how this company proposes destroy all the existing email infrastructure and force people to use their new system?”

They don’t need to. As I understand it, it’s still SMTP with a bit of information tacked on. There will be network effects on how useful it is, but it will be very useful to some people well before it gets adopted on a mass scale. The website seems to be selling it on an intra-organization basis. That seems to be where it will prove most useful in the short term, with dense networks and a central control point solving the coordination problem of switching to a new technology.

The only question is how this company proposes destroy all the existing email infrastructure and force people to use their new system?

Your post advocates a

( ) technical ( ) legislative (X) market-based ( ) vigilante

approach to fighting spam. your idea will not work. here is why it won’t work. (one or more of the following may apply to your particular idea, and it may have other flaws which used to vary from state to state before a bad federal law was passed.)

( ) spammers can easily use it to harvest email addresses
( ) mailing lists and other legitimate email uses would be affected
(X) no one will be able to find the guy or collect the money
( ) it is defenseless against brute force attacks
( ) it will stop spam for two weeks and then we’ll be stuck with it
(X) users of email will not put up with it
( ) microsoft will not put up with it
( ) the police will not put up with it
(X) requires too much cooperation from spammers
( ) requires immediate total cooperation from everybody at once
( ) many email users cannot afford to lose business or alienate potential employers
( ) spammers don’t care about invalid addresses in their lists
( ) anyone could anonymously destroy anyone else’s career or business

specifically, your plan fails to account for

( ) laws expressly prohibiting it
(X) lack of central controlling authority for email
(X) open relays in foreign countries
( ) ease of searching tiny alphanumeric address space of all email addresses
( ) asshats
(X) jurisdictional problems
(X) unpopularity of weird new taxes
( ) public reluctance to accept weird new forms of money
(X) huge existing software investment in smtp
( ) susceptibility of protocols other than smtp to attack
( ) willingness of users to install os patches received by email
( ) armies of worm riddled broadband-connected windows boxes
( ) eternal arms race involved in all filtering approaches
( ) extreme profitability of spam
( ) joe jobs and/or identity theft
( ) technically illiterate politicians
( ) extreme stupidity on the part of people who do business with spammers
(X) dishonesty on the part of spammers themselves
( ) bandwidth costs that are unaffected by client filtering
( ) outlook

and the following philosophical objections may also apply:

(X) ideas similar to yours are easy to come up with, yet none have ever been shown practical
( ) any scheme based on opt-out is unacceptable
(X) smtp headers should not be the subject of legislation
( ) blacklists suck
( ) whitelists suck
( ) we should be able to talk about viagra without being censored
( ) countermeasures should not involve wire fraud or credit card fraud
( ) countermeasures should not involve sabotage of public networks
( ) countermeasures must work if phased in gradually
( ) sending email should be free
( ) why should we have to trust you and your servers?
( ) incompatiblity with open source or open source licenses
( ) feel-good measures do nothing to solve the problem
( ) temporary/one-time email addresses are cumbersome
( ) i don’t want the government reading my email
( ) killing them that way is not slow and painful enough

furthermore, this is what i think about you:

(X) sorry dude, but i don’t think it would work.
( ) this is a stupid idea, and you’re a stupid person for suggesting it.
( ) nice try, assh0le! i’m going to find out where you live and burn your house down!