private function findFirstMessage()
    {
        $data = fgets( $this->fh );
        fseek( $this->fh, 0 );
        if ( substr( $data, 0, 18 ) === 'From MAILER-DAEMON' )
        {
            return $this->findNextMessage();
        }
        else
        {
            return 0;
        }
    }