'Send a POP3 command to which a short response is expected.
@type command: L{bytes}
@param command: A POP3 command.
@type params: stringifyable L{object} or L{None}
@param params: Command arguments.'

def sendShort(self, command, params=None):

    if (params is not None):
        self.sendLine(('%s    %s' % (command, params)))
    else:
        self.sendLine(command)
    self.command = command
    self.mode = SHORT
