2.1.3.2.15 List Server Properties
To generate a List-Help header, clients set the value of the PidTagListHelp property ([MS-OXPROPS] section 2.770).
MIME writers copy the value of the PidTagListHelp property to the List-Help header.
To generate a List-Subscribe header, clients set the value of the PidTagListSubscribe property ([MS-OXPROPS] section 2.771).
MIME writers copy the value of the PidTagListSubscribe property to the List-Subscribe header.
To generate a List-Unsubscribe header, clients set the value of the PidTagListUnsubscribe property ([MS-OXPROPS] section 2.772).
MIME writers copy the value of the PidTagListUnsubscribe property to the List-Unsubscribe header.
The List-Help, List-Subscribe, and List-Unsubscribe headers are specified in [RFC2369].