Override the MailBodyText routine. If you are using multiple CheckOut pages, this needs to be done on the CheckOut page that processes the Order.
Protected Overrides Function MailBodyText(ByVal Cart As BirdDogSoftware.Interfaces.ICart, ByVal EmailFormat As BirdDogSoftware.Interfaces.IUser.EMailFormats) As String
End Sub
The String returned by this function is used as the email confirmation.