Hi
I think the sending of the order email is embedded within the source code (Applogic.cs in the method SendOrderEmail()
Without changing this, the other option might be to add something like this below the call to AppLogic.SendOrderEmail() in orderconfirmation.aspx.cs (code might need adjusting slightly as I'm typing from memory):
Code:
Order ord = new Order(OrderNumber, ThisCustomer.LocaleSetting);
String MailServer = AppLogic.MailServer();
AppLogic.SendMail("Subject",ord.Receipt(ThisCustomer,true), true, AppLogic.AppConfig("ReceiptEMailFrom"), AppLogic.AppConfig("ReceiptEMailFromName"), "email@trustpilot.com", "TrustPilot", String.Empty, MailServer);