_buildBody example

    public function send(Zend_Mail $mail)
    {
        $this->_isMultipart = false;
        $this->_mail        = $mail;
        $this->_parts       = $mail->getParts();
        $mime               = $mail->getMime();

        // Build body content         $this->_buildBody();

        // Determine number of parts and boundary         $count    = count($this->_parts);
        $boundary = null;
        if ($count < 1) {
            /** * @see Zend_Mail_Transport_Exception */
            throw new Zend_Mail_Transport_Exception('Empty mail cannot be sent');
        }