2.2.2.10 PidTagOriginalSenderSearchKey Property

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Type: PtypBinary ([MS-OXCDATA] section 2.11.1)

The PidTagOriginalSenderSearchKey property ([MS-OXPROPS] section 2.837) contains an address book search key that is set on delivery report messages to the value of the PidTagSenderSearchKey property (section 2.2.1.52) of the original e-mail message.