If a supporter makes an order and mistypes their email address, the purchase will still complete and the patron will be added to your door list, so the purchaser can still provide their name at the door. However, getting their order confirmation to them is super easy:
With paid tickets, the patron will usually contact you to double-check if the purchase was successful before attempting to purchase again. When this happens, you can correct the email address on the patron record and an order confirmation may be resent. This information can also be corrected at the door or post-event.