我可以断定JavaMail不能与GMail帐户一起使用吗？

Question

我已经解决了这个问题好几天了。我访问了论坛，我尝试了不同的调整，但没有解决方案。

请告诉我为什么我的示例javaMail代码无法从任何Gmail帐户发送邮件？适用于SSL和TLS。

以下是我的代码段;

public class EmailUtility {

    public static String USERNAME = "???@gmail.com";
    public static String PASSWORD = "???";
    public static String HOST = "smtp.gmail.com";
    public static String PORT = "587";

    public static void sendEmail(String toAddress,
            String subject, String message) throws AddressException,
            MessagingException {

        // sets SMTP server properties
        Properties properties = new Properties();
        properties.put("mail.smtp.host", HOST );
        properties.put("mail.smtp.port", PORT );
        properties.put("mail.smtp.auth", "true");
        properties.put("mail.smtp.starttls.enable", "true");

        Authenticator auth = new Authenticator() {
            @Override
            public PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(USERNAME , PASSWORD );
            }
        };

        Session session = Session.getInstance(properties, auth);

        // creates a new e-mail message
        Message msg = new MimeMessage(session);

        msg.setFrom(new InternetAddress(USERNAME ));
        InternetAddress[] toAddresses = {new InternetAddress(toAddress)};
        msg.setRecipients(Message.RecipientType.TO, toAddresses);
        msg.setSubject(subject);
        msg.setSentDate(new Date());
        msg.setText(message);

        // sends the e-mail
        Transport.send(msg);

    }
}