public function getMail()
    {
     if (is_null($this->_mail)) {
        /* changes begin */
       $my_smtp_host = Mage::getStoreConfig('system/smtp/host');
       $my_smtp_port = Mage::getStoreConfig('system/smtp/port');
       $config = array(

                'ssl' => 'tls',
                'port' => $my_smtp_port,
                'auth' => 'login',
                'username' => 'noreply@gmail.com',
                'password' => '***************'
            );

        $transport = new Zend_Mail_Transport_Smtp($my_smtp_host, $config);
        Zend_Mail::setDefaultTransport($transport);
        /* Changes End */
        $this->_mail = new Zend_Mail('utf-8');
    }//die('abc');
    return $this->_mail;
}

Zend_Mail_Protocol_Exception: Command not implemented
 in G:xampphtdocsmcardleslibZendMailProtocolAbstract.php:431