What happens when you buy something from a site and they send your receipt (and possibly a software key) by email?
Where I work we get enough mail bounces from customers whose mailboxes are over quota, or who spelled their address wrong, and so on that challenges from the few using C/R systems are lost in the noise. No one has time to go through all of these, find the challenges, and jump through whatever hoops they want to get the message through.
Where I work we get enough mail bounces from customers whose mailboxes are over quota, or who spelled their address wrong, and so on that challenges from the few using C/R systems are lost in the noise. No one has time to go through all of these, find the challenges, and jump through whatever hoops they want to get the message through.