/**
  * Send a mail using this transport
  *
  * @param  OpenPGP_Zend_Mail $mail
  * @access public
  * @return void
  * @throws Zend_Mail_Transport_Exception if mail is empty
  */
 public function send(OpenPGP_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) {
         throw new Zend_Mail_Transport_Exception('Empty mail cannot be sent');
     }
     if ($count > 1) {
         // Multipart message; create new MIME object and boundary
         $mime = new Zend_Mime($this->_mail->getMimeBoundary());
         $boundary = $mime->boundary();
     } elseif ($this->_isMultipart) {
         // multipart/alternative -- grab boundary
         $boundary = $this->_parts[0]->boundary;
     }
     // Determine recipients, and prepare headers
     $this->recipients = implode(',', $mail->getRecipients());
     $this->_prepareHeaders($this->_getHeaders($boundary));
     // Create message body
     // This is done so that the same OpenPGP_Zend_Mail object can be used in
     // multiple transports
     $message = new Zend_Mime_Message();
     $message->setParts($this->_parts);
     $message->setMime($mime);
     $this->body = $message->generateMessage($this->EOL);
     ////////////////////////////////////////////////////////
     //                                                    //
     // ALPHAFIELDS 2012-11-03: ADDED PGP/MIME ENCRYPTION  //
     // USING lib/openpgp/opepgplib.php                    //
     //                                                    //
     ////////////////////////////////////////////////////////
     // get from globals (set in tiki-setup.php)
     global $openpgplib;
     $pgpmime_msg = $openpgplib->prepareEncryptWithZendMail($this->header, $this->body, $mail->getRecipients());
     $this->header = $pgpmime_msg[0];
     // set pgp/mime headers from result array
     $this->body = $pgpmime_msg[1];
     // set pgp/mime encrypted message body from result array
     ////////////////////////////////////////////////////////
     //                                                    //
     // ALPHAFIELDS 2012-11-03: ..END PGP/MIME ENCRYPTION  //
     //                                                    //
     ////////////////////////////////////////////////////////
     // Send to transport!
     $this->_sendMail();
 }