A URL indicating how the receipt is to be delivered.
This property corresponds to the Receipt-delivery-option header in the AS2 request. If nonempty, the client has requested that the receipt be sent asynchronously to the URL specified. If empty, the receipt is to be delivered synchronously in the HTTP reply. In either case, the receipt is delivered once the response message has been prepared and returned to the adapter.
ReceiptDeliveryOption does not indicate whether or not a receipt was actually requested. If an MDN was requested, that information is given in MDNTo.
This property is not available in the Sender.