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2.2.3.3 attFrom Attribute Handling by the TNEF Writer

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When encoding the sender-email field of the attFrom attribute, as specified in section 2.1.3.3.3, the TNEF Writer can use the PidTagSenderName ([MS-OXOMSG] section 2.2.1.51), PidTagSenderAddressType ([MS-OXOMSG] section 2.2.1.48), and PidTagSenderEmailAddress ([MS-OXOMSG] section 2.2.1.49) properties if present, or access their values using the PidTagSenderEntryId property ([MS-OXOMSG] section 2.2.1.50).

When TNEF is being used to encode an attached message, the sender information is carried in encapsulated message properties in the attFrom attribute.