See the image below for an example of the ticket confirmation email. Customers who purchase a ticket will have this emailed to them within seconds of completing their purchase. An event host can resend this email at any time from the order page.
The subject of the email confirmation will start with the name of the ticketing site follow by "Order Confirmation". For example, tickets bought via ontaptickets.com will have the subject line, "On Tap Tickets | Order Confirmation [order_number]".