Using JavaMail with TLS

Properties props = new Properties();
        props.put("mail.smtp.starttls.enable","true");
        props.put("mail.smtp.auth", "true");  // If you need to authenticate
        // Use the following if you need SSL
        props.put("mail.smtp.socketFactory.port", d_port);
        props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.socketFactory.fallback", "false");

javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?

java.util.Properties props = new java.util.Properties();
props.put("mail.smtp.starttls.enable", "true");

props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");