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PidTagListUnsubscribe Canonical Property
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Contains the value of a Multipurpose Internet Mail Extensions (MIME) message's List-Unsubscribe header field.
PR_LIST_UNSUBSCRIBE, PR_LIST_UNSUBSCRIBE_A, PR_LIST_UNSUBSCRIBE_W
To generate a List-Unsubscribe header field, clients must set these properties to the desired value. MIME writers must copy the value of these properties to the List-Unsubscribe header field.
To set the value of these list server-related properties, MIME clients must write the header fields as specified in the following table.
Preferred header field name
Alternate header field name