That's a commonly held misbelief. If it's an honest mistake, there's no requirement to sell it, and beyond that most email confirmations say something like thi

That's a commonly held misbelief. If it's an honest mistake, there's no requirement to sell it, and beyond that most email confirmations say something like this from Amazon: This e-mail is only an acknowledgement of receipt of your order and your contract to purchase these items is not complete until we send you an e-mail notifying you that the items have been dispatched to you.