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PidTagReadReceiptSearchKey Canonical Property
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Contains a search key for the messaging user to which the messaging system should direct a read report for a 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 search key contained in the PR_SENDER_SEARCH_KEY (PidTagSenderSearchKey) property at message submission time.