Used to indicate that a message disposition notification is requested.
If this property is set, a Disposition-Notification-To header will be added to the request, and an MDN will be requested. The value may be an email address, URL, etc., and while the presence of this header is necessary for an MDN to be returned, typically the value of the header will be ignored by the server.
By default, the adapter will request a PKCS#7 signature and synchronous delivery. You may set MDNDeliveryOption to request an asynchronous MDN, and you may set MDNOptions to request a different type of signature, or no signature at all.
This property is not available in the Receiver.