MailItem.Sensitivity (Outlook)
Returns or sets a constant in the OlSensitivity enumeration indicating the sensitivity for the Outlook item. Possible return values are olConfidential - Confidential, olNormal - Normal sensitivity, olPersonal - Personal, olPrivate - Private.
This property corresponds to the MAPI property PidTagSensitivity.
Session.CreateSharingItem.Reply.Sensitivity = olConfidential