The commands,

        MODE BLOCK
        ENCODING BASE64
        SEND [.GIF]BOATS*.GIF
        SEND/MODE=TEXT [GIF]INDEX.TXT

      set the default reading mode to BLOCK and the default file
      encoding to BASE64. Any files matching the specification
      [GIF]BOATS*.GIF will be sent using these defaults. However,
      the file [GIF]INDEX.TXT will be sent as an ordinary text file
      owing to the use of the /MODE=TEXT qualifier.