def _deliver_command(self, msg, msginfo, delivered_to, received,
               stdout, stderr):
  try:
    # Write out message with native EOL convention
    msgfile = tempfile.TemporaryFile()
    msgfile.write(msg.flatten(delivered_to, received,
                              include_from=self.conf['unixfrom']))
    msgfile.flush()
    os.fsync(msgfile.fileno())
    # Rewind
    msgfile.seek(0)
    # Set stdin to read from this file
    os.dup2(msgfile.fileno(), 0)
    # Set stdout and stderr to write to files
    os.dup2(stdout.fileno(), 1)
    os.dup2(stderr.fileno(), 2)

os.dup2(stdout.fileno(), 1)