2.2.3.2.19 Purported Sender Domain
MIME readers SHOULD<129> copy the value of the X-MS-Exchange-Organization-PRD header to the PidTagPurportedSenderDomain property ([MS-OXCMSG] section 2.2.1.43).
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MIME readers SHOULD<129> copy the value of the X-MS-Exchange-Organization-PRD header to the PidTagPurportedSenderDomain property ([MS-OXCMSG] section 2.2.1.43).