Uncaught PHP Exception Swift_TransportException: "Expected response code 220 but got code "", with message """ at C:HostingSpacesabcdomain.comwwwrootvendorswiftmailerswiftmailerlibclassesSwiftTransportAbstractSmtpTransport.php line 383 {"exception":"[object] (Swift_TransportException(code: 0): Expected response code 220 but got code "", with message "" at C:\HostingSpaces\abc\domain.com\wwwroot\vendor\swiftmailer\swiftmailer\lib\classes\Swift\Transport\AbstractSmtpTransport.php:383)"} []

swiftmailer:
    transport:  smtp
    host:       smtp.gmail.com
    username:   [email protected]
    password:   password
    port:       465
    encryption: ssl
    spool: { type: memory }

public function send_new_order_email($entity) {
    try{
        $message = $this->getEmailObj("[email protected]");
        $message->setBody(
                $this->renderView(
                    'APIBundle:Emails:ops_neworder.html.twig',
                    array('entity' => $entity)
                ),
                'text/html'
            )->setSubject('New Order : '.$entity->getId());

        $this->container->get('mailer')->send($message);
    }
    catch(Exception $e){}
}

private function getEmailObj($email){
    $message = Swift_Message::newInstance()
            ->setFrom('[email protected]')
            ->setTo($email);
    return $message;
}

swiftmailer:
    transport: gmail
    username:  your_gmail_username
    password:  your_gmail_password