无法使用公司服务器发送 SSL 邮件

Question

我有这段代码可以使用 SSL 和公司邮件服务器发送邮件。

public static void Send(final String username, final String password, String recipientEmail, String ccEmail, String title, String message) throws AddressException, MessagingException {
    System.setProperty("java.net.useSystemProxies", "true");

    Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());

    // Get a Properties object
    Properties props = System.getProperties();
    props.setProperty("mail.smtps.starttls.enable", "true");  
    props.setProperty("mail.smtps.host", "mail.company.au");
    props.setProperty("mail.smtps.user", username);
    props.setProperty("mail.smtps.password", password);
    props.setProperty("mail.smtps.port", "587");
    props.setProperty("mail.smtps.auth", "true");
    props.setProperty("mail.smtps.socketFactory.class",
            "javax.net.ssl.SSLSocketFactory");
    props.setProperty("mail.smtps.timeout", "5000");
    props.setProperty("mail.smtps.connectiontimeout", "5000");
    props.setProperty("mail.smtps.writetimeout", "5000");


    Session session = Session.getInstance(props,null);
    session.setDebug(true);
    MimeMessage msg = new MimeMessage(session);

    // -- Set the FROM and TO fields --
    msg.setFrom(new InternetAddress(username));
    msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipientEmail, false));

    if (ccEmail.length() > 0) {
        msg.setRecipients(Message.RecipientType.CC, InternetAddress.parse(ccEmail, false));
    }

    msg.setSubject(title);
    msg.setText(message, "utf-8");
    msg.setSentDate(new Date());

    SMTPTransport t = (SMTPTransport)session.getTransport("smtps");

    t.connect("mail.company.au", username, password);
    t.sendMessage(msg, msg.getAllRecipients());
    t.close();
}

但是我得到了这个错误，有人可以帮忙吗？

调试 SMTP：异常读取响应：javax.net.ssl.SSLException： 无法识别的 SSL 消息，明文连接？

Answer 1

这是几个月前我在某个地方找到的一个 sn-p。（我不记得具体在哪里）。

public static void sendMail(String recipient, String subject, String content) {
// config
// Sender's email ID 
String from = "YOUR SENDER ADDRESS HERE";

// Get system properties
Properties properties = System.getProperties();
// Setup mail server
properties.setProperty("mail.smtps.host", "PLACE YOUR SERVER DOMAIN e.g. smtps.example.com");
properties.setProperty("mail.smtps.port", "465");
properties.setProperty("mail.smtps.auth", "true");
properties.setProperty("mail.user", "YOUR USERNAME");
properties.setProperty("mail.password", "YOUR SMTP PASSWORD");
//properties.put("mail.debug", "true");

// Get the default Session object.
Session session = Session.getDefaultInstance(properties);

try{
  MimeMessage message = new MimeMessage(session);

  // Set From: header field of the header.
  message.setFrom(new InternetAddress(from));

  // Set To: header field of the header.
  message.addRecipient(Message.RecipientType.TO,
      new InternetAddress(recipient));

  message.setSubject(subject);
  message.setText(content);

  Transport trnsport;
  trnsport = session.getTransport("smtps");
  trnsport.connect(null, properties.getProperty("mail.password"));
  message.saveChanges();
  trnsport.sendMessage(message, message.getAllRecipients());
  trnsport.close();
  System.out.println("Sent message successfully....");
}catch (MessagingException mex) {
  mex.printStackTrace();
}

}