class Net::POP3

def do_finish # :nodoc:

:nodoc:
- quits the current command, if any
- number counter for bytes
- number counter for mails
- mails
nil's out the: 
def do_finish # :nodoc:
  @mails = nil
  @n_mails = nil
  @n_bytes = nil
  @command.quit if @command
ensure
  @started = false
  @command = nil
  @socket.close if @socket
  @socket = nil
end