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If the user or user agent who is sending the e-mail message is the mailbox owner and the represented sender properties are currently not present, the following represented sender properties MUST be set to the mailbox owner:
PidTagSentRepresentingAddressType (section 2.2.1.54)
PidTagSentRepresentingEmailAddress (section 2.2.1.55)
PidTagSentRepresentingEntryId (section 2.2.1.56)
PidTagSentRepresentingName (section 2.2.1.57)
PidTagSentRepresentingSearchKey (section 2.2.1.58)