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PidLidValidFlagStringProof Canonical Property
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Long ID (LID):
On non-sendable objects (received mail and non-mail objects), clients should set this value to the value of PR_MESSAGE_DELIVERY_TIME when modifying dispidRequest.
Since the value of PR_MESSAGE_DELIVERY_TIME cannot be predicted by the sender, if the value of this property is equal to the value of PR_MESSAGE_DELIVERY_TIME, it is reasonably certain that the value of dispidRequest did not originate from the sender of the message. A client can decide how to present the value of dispidRequest to the end user based on the result of this comparison in accordance with the specific security policy of the client. If the value of dispidRequest is ignored due to the presence of a value for dispidFlagStringEnum (PidLidFlagString), this property must be ignored.