public function generateBody()
    {
        $data = $this->noMimeMessage . ezcMailTools::lineBreak();
        foreach ( $this->parts as $part )
        {
            $data .= ezcMailTools::lineBreak() . '--' . $this->boundary . ezcMailTools::lineBreak();
            $data .= $part->generate();
        }
        $data .= ezcMailTools::lineBreak() . '--' . $this->boundary . '--';
        return $data;
    }