PidTagOriginalSenderSearchKey Canonical Property
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Contains the search key for the sender of the first version of a message, that is, the message before being forwarded or replied to.
This property is one of the address properties for the original sender of a message. At first submission of the message, the client application should set this property to the value of the PR_SENDER_SEARCH_KEY (PidTagSenderSearchKey) property. It is never changed when the message is forwarded or replied to.