GreenMail - no error but no received messages

I am trying to use GreenMail to test if the code send an email correctly but it seems that GreenMail is not receiving the email.

What am I doing wrong?

Security.setProperty("ssl.SocketFactory.provider", 
        DummySSLSocketFactory.class.getTypeName());
GreenMail greenMail = new GreenMail(ServerSetup.SMTPS);
greenMail.start();
{
    // This is the test subject that I moved here to compact the code
    Security.addProvider(new Provider());

    Properties props = new Properties();
    props.put("mail.smtp.host", "email-smtp.XXX.amazonaws.com");
    props.put("mail.smtp.auth", "true");
    props.put("mail.debug", "true");
    props.put("mail.smtp.port", "465");
    props.put("mail.smtp.socketFactory.port", "465");
    props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
    props.put("mail.smtp.socketFactory.fallback", "false");

    Session session = Session.getDefaultInstance(props,
            new javax.mail.Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication("XXX", "XXX");
                }
            });
    session.setDebug(true);

    Message message = new MimeMessage(session);
    message.setFrom(new InternetAddress("XXX@XXX.com"));
    message.setRecipients(Message.RecipientType.TO, 
            new InternetAddress[]{new InternetAddress("XXX@XXX.com")});
    message.setSubject("XXX");
    message.addHeader("Content-type", "text/html; charset=UTF-8");
    message.setContent("XXX", "text/html");

    Transport.send(message);
}
assertEquals(greenMail.getReceivedMessages().length, 1);