> So this is essentially delegating authentication to the user's Email service. Delegating authentication seems like a good idea: fewer passwords to forget and more conveniene. So why not delegate to a proper authentication service like OpenID?
Because the user is more likely to have email than OpenID, so delegating to an option of one or the other is more complex, and delegating to only the latter is limiting your market.
Because the user is more likely to have email than OpenID, so delegating to an option of one or the other is more complex, and delegating to only the latter is limiting your market.