The level of end user interaction involved in sending the MDN.
Possible ValuesAutomatic (0)
User Configurable (1)
MDNSendingMode allows the server software to describe the level of user interaction in sending the MDN. MDNSendingMode corresponds to the "disposition-mode" field in the Disposition Header, as described further in RFC 3335.
By default, the disposition-mode value will be "automatic-action/MDN-sent-automatically".
This property is not available in the Sender.