PidTagReadReceiptEntryId Canonical Property
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Contains an entry identifier for the messaging user where the messaging system should direct a read report for this message.
This property is ignored unless the PR_READ_RECEIPT_REQUESTED (PidTagReadReceiptRequested) property is set to TRUE.
If a client application wants to receive read reports itself, it can leave this property unset or set it to the entry identifier contained in the PR_SENDER_ENTRYID (PidTagSenderEntryId) property at message submission time.