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PidTagOriginalSenderEmailAddress Canonical Property
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Contains the e-mail address of the sender of the first version of a message, that is, the message before being forwarded or replied to.
PR_ORIGINAL_SENDER_EMAIL_ADDRESS, PR_ORIGINAL_SENDER_EMAIL_ADDRESS_A, PR_ORIGINAL_SENDER_EMAIL_ADDRESS_W
These properties are examples 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 PR_SENDER_EMAIL_ADDRESS (PidTagSenderEmailAddress). It is never changed when the message is forwarded or replied to.