function email($to, $subject, $body) {
    require_once('_swiftmailer/lib/swift_required.php');

    try {
        $transport = Swift_SmtpTransport::newInstance('localhost');
        $mailer = Swift_Mailer::newInstance($transport);

	// change hostname and port
	$mailer->getTransport()
		->setHost('smtp.domain.com')
		->setPort(666);

        $message = Swift_Message::newInstance()
            ->setFrom('from@domain.com', 'From name')
            ->setTo($to)
            ->setSubject($subject)
            ->setBody($body, 'text/html')
        ;
        return $mailer->send($message);

    } catch (Exception $e) {
        return false;
    }
}

email('send@mail.to', 'subject', 'body');