$mp->encoding = $encoding;        $mp->type = $mimeType;        $mp->disposition = $disposition;        $mp->filename = $filename;        $this->addAttachment($mp);        return $mp;    }    /**     * Return a count of message parts     *     * @return integer     */    public function getPartCount()    {        return count($this->_parts);    }    /**     * Encode header fields     *     * Encodes header content according to RFC1522 if it contains non-printable     * characters.     *     * @param  string $value     * @return string     */    protected function _encodeHeader($value)    {      if (Zend_Mime::isPrintable($value)) {          return $value;      } else {          $quotedValue = Zend_Mime::encodeQuotedPrintable($value);          $quotedValue = str_replace(array('?', ' '), array('=3F', '=20'), $quotedValue);          return '=?' . $this->_charset . '?Q?' . $quotedValue . '?=';      }    }    /**     * Add a header to the message     *     * Adds a header to this message. If append is true and the header already     * exists, raises a flag indicating that the header should be appended.     *     * @param string  $headerName     * @param string  $value     * @param boolean $append     */    protected function _storeHeader($headerName, $value, $append=false)    {// ??        $value = strtr($value,"\r\n\t",'???');        if (isset($this->_headers[$headerName])) {            $this->_headers[$headerName][] = $value;        } else {            $this->_headers[$headerName] = array($value);        }        if ($append) {            $this->_headers[$headerName]['append'] = true;        }    }    /**     * Add a recipient     *     * @param string $email     */    protected function _addRecipient($email, $to = false)    {        // prevent duplicates        $this->_recipients[$email] = 1;        if ($to) {            $this->_to[] = $email;        }    }    /**     * Helper function for adding a recipient and the corresponding header     *     * @param string $headerName     * @param string $name     * @param string $email     */    protected function _addRecipientAndHeader($headerName, $name, $email)    {        $email = strtr($email,"\r\n\t",'???');        $this->_addRecipient($email, ('To' == $headerName) ? true : false);        if ($name != '') {            $name = '"' . $this->_encodeHeader($name) . '" ';        }        $this->_storeHeader($headerName, $name .'<'. $email . '>', true);    }    /**     * Adds To-header and recipient     *     * @param  string $name     * @param  string $email     * @return Zend_Mail Provides fluent interface     */    public function addTo($email, $name='')    {        $this->_addRecipientAndHeader('To', $name, $email);        return $this;    }    /**     * Adds Cc-header and recipient     *     * @param  string    $name     * @param  string    $email     * @return Zend_Mail Provides fluent interface     */    public function addCc($email, $name='')    {        $this->_addRecipientAndHeader('Cc', $name, $email);        return $this;    }    /**     * Adds Bcc recipient     *     * @param  string    $email     * @return Zend_Mail Provides fluent interface     */    public function addBcc($email)    {        $this->_addRecipientAndHeader('Bcc', '', $email);        return $this;    }    /**     * Return list of recipient email addresses     *     * @return array (of strings)     */    public function getRecipients()    {        return array_keys($this->_recipients);    }    /**     * Sets From-header and sender of the message     *     * @param  string    $email     * @param  string    $name     * @return Zend_Mail Provides fluent interface     * @throws Zend_Mail_Exception if called subsequent times     */    public function setFrom($email, $name = '')    {        if ($this->_from === null) {            $email = strtr($email,"\r\n\t",'???');            $this->_from = $email;            $this->_storeHeader('From', $this->_encodeHeader('"'.$name.'"').' <'.$email.'>', true);        } else {            /**             * @see Zend_Mail_Exception             */            require_once 'Zend/Mail/Exception.php';            throw new Zend_Mail_Exception('From Header set twice');        }        return $this;    }    /**     * Returns the sender of the mail     *     * @return string     */    public function getFrom()    {        return $this->_from;    }    /**     * Sets the Return-Path header for an email     *     * @param  string    $email     * @return Zend_Mail Provides fluent interface     * @throws Zend_Mail_Exception if set multiple times     */    public function setReturnPath($email)    {        if ($this->_returnPath === null) {            $email = strtr($email,"\r\n\t",'???');            $this->_returnPath = $email;            $this->_storeHeader('Return-Path', $email, false);        } else {            /**             * @see Zend_Mail_Exception             */            require_once 'Zend/Mail/Exception.php';            throw new Zend_Mail_Exception('Return-Path Header set twice');        }        return $this;    }    /**     * Returns the current Return-Path address for the email     *     * If no Return-Path header is set, returns the value of {@link $_from}.     *     * @return string     */    public function getReturnPath()    {        if (null !== $this->_returnPath) {            return $this->_returnPath;        }        return $this->_from;    }    /**     * Sets the subject of the message     *     * @param   string    $subject     * @return  Zend_Mail Provides fluent interface     * @throws  Zend_Mail_Exception     */    public function setSubject($subject)    {        if ($this->_subject === null) {            $subject = strtr($subject,"\r\n\t",'???');            $this->_subject = $this->_encodeHeader($subject);            $this->_storeHeader('Subject', $this->_subject);        } else {            /**             * @see Zend_Mail_Exception             */            require_once 'Zend/Mail/Exception.php';            throw new Zend_Mail_Exception('Subject set twice');        }        return $this;    }    /**     * Returns the encoded subject of the message     *     * @return string     */    public function getSubject()    {        return $this->_subject;    }        /**     * Sets Date-header     *     * @param  string    $date     * @return Zend_Mail Provides fluent interface     * @throws Zend_Mail_Exception if called subsequent times     */    public function setDate($date = null)    {        if ($this->_date === null) {            if ($date === null) {                $date = date('r');            } else if (is_int($date)) {                $date = date('r', $date);            } else if (is_string($date)) {            	$date = strtotime($date);                if ($date === false || $date < 0) {                    throw new Zend_Mail_Exception('String representations of Date Header must be ' .                                                  'strtotime()-compatible');                }                $date = date('r', $date);            } else if ($date instanceof Zend_Date) {                $date = $date->get(Zend_Date::RFC_2822);            } else {                throw new Zend_Mail_Exception(__METHOD__ . ' only accepts UNIX timestamps, Zend_Date objects, ' .                                              ' and strtotime()-compatible strings');            }            $this->_date = $date;            $this->_storeHeader('Date', $date);        } else {            throw new Zend_Mail_Exception('Date Header set twice');        }        return $this;    }    /**     * Returns the formatted date of the message     *     * @return string     */    public function getDate()    {        return $this->_date;    }    /**     * Add a custom header to the message     *     * @param  string              $name     * @param  string              $value     * @param  boolean             $append     * @return Zend_Mail           Provides fluent interface     * @throws Zend_Mail_Exception on attempts to create standard headers     */    public function addHeader($name, $value, $append = false)    {        if (in_array(strtolower($name), array('to', 'cc', 'bcc', 'from', 'subject', 'return-path', 'date'))) {            /**             * @see Zend_Mail_Exception             */            require_once 'Zend/Mail/Exception.php';            throw new Zend_Mail_Exception('Cannot set standard header from addHeader()');        }        $value = strtr($value,"\r\n\t",'???');        $value = $this->_encodeHeader($value);        $this->_storeHeader($name, $value, $append);        return $this;    }    /**     * Return mail headers     *     * @return void     */    public function getHeaders()    {        return $this->_headers;    }    /**     * Sends this email using the given transport or a previously     * set DefaultTransport or the internal mail function if no     * default transport had been set.     *     * @param  Zend_Mail_Transport_Abstract $transport     * @return Zend_Mail                    Provides fluent interface     */    public function send($transport = null)    {        if ($transport === null) {            if (! self::$_defaultTransport instanceof Zend_Mail_Transport_Abstract) {                require_once 'Zend/Mail/Transport/Sendmail.php';                $transport = new Zend_Mail_Transport_Sendmail();            } else {                $transport = self::$_defaultTransport;            }        }        if (is_null($this->_date)) {            $this->setDate();        }        $transport->send($this);        return $this;    }}