获取 javax.mail.MessagingException 和 java.net.SocketException

Question

我正在尝试使用我的 yahoo(smtp.mail.yahoo.com) 帐户的 SMTP 向我的 gmail 帐户发送电子邮件。

但我遇到了以下异常。

javax.mail.MessagingException: Exception reading response;
  nested exception is:
        java.net.SocketException: Connection reset
        at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2153)
        at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1912)
        at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:638)
        at javax.mail.Service.connect(Service.java:295)
        at javax.mail.Service.connect(Service.java:176)
        at javax.mail.Service.connect(Service.java:125)
        at javax.mail.Transport.send0(Transport.java:194)
        at javax.mail.Transport.send(Transport.java:124)
        at Sendmail.postMail(Sendmail.java:40)
        at Sendmail.main(Sendmail.java:49)
Caused by: java.net.SocketException: Connection reset
        at java.net.SocketInputStream.read(SocketInputStream.java:168)
        at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:110)
        at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
        at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
        at com.sun.mail.util.LineInputStream.readLine(LineInputStream.java:89)
        at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2131)
        ... 9 more
BUILD SUCCESSFUL (total time: 2 seconds)


import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;

代码：

public class Sendmail {

    public void postMail( String recipients[ ], String subject, String message , String from) throws MessagingException {

        boolean debug = false;

        // Set the host smtp address
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.mail.yahoo.com");

        // create some properties and get the default Session
        Session session = Session.getDefaultInstance(props, null);
        session.setDebug(debug);

        // create a message
        Message msg = new MimeMessage(session);

        // set the from and to address
        InternetAddress addressFrom = new InternetAddress(from);
        msg.setFrom(addressFrom);

        InternetAddress[] addressTo = new InternetAddress[recipients.length];
        for (int i = 0; i < recipients.length; i++) {
            addressTo[i] = new InternetAddress(recipients[i]);
        }
        msg.setRecipients(Message.RecipientType.TO, addressTo);


        // Optional : You can also set your custom headers in the Email if you Want
        msg.addHeader("MyHeaderName", "myHeaderValue");

        // Setting the Subject and Content Type
        msg.setSubject(subject);
        msg.setContent(message, "text/plain");
        Transport.send(msg);
    }

    public static void main(String[] args) {

        try{

            Sendmail sende = new Sendmail();
            String senderemailid [] = {"[email protected]"};
            sende.postMail(senderemailid,"Hi","Come to room","[email protected]");

        }catch(MessagingException e){
            e.printStackTrace();
        }        
    }
}

Answer 1

smtp.mail.yahoo.net 是指向多个不同邮件服务器的 CNAME。雅虎今天的邮件服务器碰巧出现了一些问题...

broach@broach-laptop:~$ telnet smtp.mail.yahoo.com 25
Trying 98.136.185.95...
Connected to smtp.mail.us.am0.yahoodns.net.
Escape character is '^]'.
Connection closed by foreign host.

broach@broach-laptop:~$ telnet smtp.mail.yahoo.com 25
Trying 98.138.84.55...
Connected to smtp.mail.us.am0.yahoodns.net.
Escape character is '^]'.
220 smtp113.mail.ne1.yahoo.com ESMTP

broach@broach-laptop:~$ telnet smtp.mail.yahoo.com 25
Trying 98.139.212.139...
Connected to smtp.mail.us.am0.yahoodns.net.
Escape character is '^]'.
Connection closed by foreign host.

刚才尝试了 5 次，有 3 次失败，2 次连接。

Answer 2

尝试设置 mail.transport.protocol 属性

props.put("mail.transport.protocol", "smtp");
props.put("mail.smtp.port", "25");

不过，您确实需要一些其他代码来进行身份验证。雅虎要求您在使用他们的 smtp 服务之前验证自己 - 他们不允许任何人使用他们的 smtp 服务器进行中继

Answer 3

这是我的代码，以防万一：

 import java.util.*;
    import javax.mail.*;
    import javax.mail.internet.*;
    import javax.activation.*;

    public class SendEmail
    {
       public static void main(String [] args)
       {    
          // Recipient's email ID needs to be mentioned.
          String to = "[email protected]";

          // Sender's email ID needs to be mentioned
          String from = "[email protected]";

          // Assuming you are sending email from localhost
          String host = "localhost";

          // Get system properties
          Properties properties = System.getProperties();

          // Setup mail server
          properties.put("mail.transport.protocol", "smtp");
          properties.put("mail.smtp.port", "25");
          properties.put("mail.smtp.host", "smtp.mail.yahoo.com.net");

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

          try{
             // Create a default MimeMessage object.
             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(to));

             // Set Subject: header field
             message.setSubject("This is the Subject Line!");

             // Now set the actual message
             message.setText("This is actual message");

             // Send message
             Transport.send(message);
             System.out.println("Sent message successfully....");
          }catch (MessagingException mex) {
             mex.printStackTrace();
          } //catch(Message)
       }
    }

Answer 4

（2019 年 7 月）

我也遇到了这个异常，为我解决的是：（

我使用多个服务器）

1. 停止每个服务器（确保最后启动的服务器，首先运行（检查哪个服务器依赖于哪个服务器） ），基本上按 DESC 运行顺序停止服务器）；

2. 关闭 Eclipse（我正在使用 Eclipse Java EE IDE for Web Developers。版本：Neon.3 Release (4.6.3) Build id: 20170314-1500）；

（2.5. 检查并终止与您的项目相关的任何其他 java 进程）

3. 启动 Eclipse 并以正确的顺序运行服务器和您的类等。

就我而言，重新启动帮助我发送电子邮件。