2.3.3.11 attSentFor Attribute Handling by the TNEF Reader
The TNEF Reader SHOULD decode the attSentFor attribute, as specified in section 2.1.3.3.17, into the PidTagSentRepresenting_XXX properties, as specified in section 2.1.3.1.1.
The TNEF Reader SHOULD set the PidTagSentRepresentingEntryId property ([MS-OXOMSG] section 2.2.1.56) and SHOULD decode the attOwner attribute, as specified in section 2.1.3.3.16, into the other PidTagSentRepresenting_XXX properties.