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PidTagOriginalAuthorEmailAddress Canonical Property
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Contains the e-mail address of the author of the first version of a message, that is, the message before being forwarded or replied to.
PR_ORIGINAL_AUTHOR_EMAIL_ADDRESS, PR_ORIGINAL_AUTHOR_EMAIL_ADDRESS_A, PR_ORIGINAL_AUTHOR_EMAIL_ADDRESS_W
These properties are examples of the address properties for the author of a message. At first submission of the message, the client application should set these properties to the value of the PR_SENDER_EMAIL_ADDRESS (PidTagSenderEmailAddress) property. It is never changed when the message is forwarded or replied to.
The original author properties allow for preservation of information from outside the local messaging domain. When a message arrives from another messaging domain, such as from the Internet, these properties provide a way to ensure that original information is not lost.