2.1.3.2.23 Purported Sender Domain

To generate an X-MS-Exchange-Organization-PRD header, clients set the value of the PidTagPurportedSenderDomain property ([MS-OXCMSG] section 2.2.1.43).

MIME writers SHOULD<54> copy the value of the PidTagPurportedSenderDomain property to the X-MS-Exchange-Organization-PRD header.