The confirmation email is sent automatically as soon as the order is submitted. I believe it is sent to the email address that is on the account. If it didn't ask you for an email address during the checkout process, that is what happens for sure.
Hi Brian,Most of the S8+ orders were shipped out already, with some expecting to ship out at the end of the week. As it was posted above, all confirmations are sent to the e-mail registered to the account you were signed in with at the time of purchase of the phone.