SharingItem.ReadReceiptRequested Property (Outlook)
Published: July 16, 2012
Returns a Boolean value that indicates true if a read receipt has been requested by the sender.
This property corresponds to the MAPI property PidTagReadReceiptRequested. This property is read/write for SharingItem objects that have been created but have not been sent or posted; it is read-only for sent SharingItem objects.