Question

以下是我发送电子邮件的行为

已编辑的代码

 public class EmailAlerts{



public  static Session session=null;
public static final  String fromAddr="from@gmail.com";
public static final   String host = "smtp.gmail.com";
public static final String password="dfd";
public static  MimeMessage message= null;

public EmailAlerts() {

    Properties props = new Properties();
    props.put("mail.smtp.host", "smtp.gmail.com");
    props.put("mail.smtp.socketFactory.port", "465");
    props.put("mail.smtp.socketFactory.class",
            "javax.net.ssl.SSLSocketFactory");
    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.port", "465");

     session = Session.getDefaultInstance(props,
        new javax.mail.Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(fromAddr,password);
            }
        });

}

/**
 * @param args  
 * 
 * 
 */



public static void sendNotification( String toAddress)
{

    try {

         message = new MimeMessage(session);
        message.setFrom(new InternetAddress(fromAddr));
        message.addRecipient(Message.RecipientType.TO,
                 new InternetAddress(toAddress));
        message.setSubject("Exchange Rate Notification!");
        message.setText("The best rates are :");//+body. Need to add date from the Map/List with the rates in descending order!

        Transport.send(message);

    } 


    catch ( MessagingException e) {
        // TODO Auto-generated catch block
        //Need to write a custom exception handler
        e.printStackTrace();
    }

}
public static void main(String[] args) {
    // TODO Auto-generated method stub
    sendNotification("toAddr@gm.com");
    System.out.println("Done!");

}

但是，我在第50行遇到一个例外，说SMTP主机正在尝试连接到localhost

javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25, response: 421

    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1270)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:370)
    at javax.mail.Service.connect(Service.java:275)
    at javax.mail.Service.connect(Service.java:156)
    at javax.mail.Service.connect(Service.java:105)
    at javax.mail.Transport.send0(Transport.java:168)
    at javax.mail.Transport.send(Transport.java:98)
    at com.business.alerts.EmailAlerts.sendNotification(EmailAlerts.java:50)
    at com.business.alerts.EmailAlerts.main(EmailAlerts.java:64)

当我真正尝试连接到Gmail时。

有什么想法吗？

Answer 1

属性mail.smtp.port应设置为465。

Answer 2

我正在使用你在我的应用程序中显示的确切代码，它完全正常。

然而，我看到的唯一区别是，我使用的是有效“来自”地址和有效密码。我能想到的唯一另一个原因是您的系统上阻止了端口465上的传出流量，但您显示的错误代码也没有提示。

421 <domain> Service not available, closing transmission channel

您可以尝试使用有效的“发件人”地址，看看是否适合您。

使用带有javamail的java发送电子邮件

2 个答案: