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PidTagOriginalSenderAddressType Canonical Property
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Contains the address type of the sender of the first version of a message, that is, the message before being forwarded or replied to.
PR_ORIGINAL_SENDER_ADDRTYPE, PR_ORIGINAL_SENDER_ADDRTYPE_A, PR_ORIGINAL_SENDER_ADDRTYPE_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 these properties to the value of PR_SENDER_ADDRTYPE (PidTagSenderAddressType). It is never changed when the message is forwarded or replied to.