Message security (when entering a message)

 Message Security Types
  D = Date when the message will be deleted, available only with proper
      security level.  All messages of this type are Public.
  N = None, message is Public.
  G = Group Password is required to read the message.
  R = Receiver is only person who can read the message, ie. private message.
  S = Sender Password is required to (K)ill the message.

 Subcommands
  NONE