General
  The messages displayed in private mail are visible only to you and the single recipient.
Combined View
  Complete conversations can be viewed in a continuous thread by selecting Combined View. Available conversations are displayed beneath the menu in the side panel.
Inbox/Outbox
  Individual sent messages are viewed by selecting Outbox, and incoming messages are viewed using the Inbox filter.
New Message
  Individual messages have delivery reports that can be viewed using the drop-down menu. Messages can also be recalled from the same menu, which can prevent the recipient from viewing the message if they have not already read it.