回复邮件时无法连接到 SMTP 主机：localhost，端口：25

Question

我有一个代码连接到邮件服务器并搜索特定主题标签并将响应发送回（回复）该特定邮件。

然而，在回复消息时，我收到以下错误：

Could not connect to SMTP host: localhost, port: 25

我能够直接发送电子邮件，只有当我使用 REPLY/FORWARD 方法时才会出现问题。我正在使用 javamail。

import java.util.*;
import javax.mail.*; 
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.search.SearchTerm;
import javax.mail.search.SubjectTerm;



public class Mail { 

    public static void main(String args[]) throws Exception { 

        Properties properties = System.getProperties();
        Session session = Session.getDefaultInstance(properties);
        Store store = session.getStore("pop3");
        store.connect("smtp.gotouchpoint.com", "username", "password");
        Folder folder = store.getFolder("inbox");

        //Connect to the current host using the specified username and password.



        try {

            //Create a Folder object corresponding to the given name.
            //   Folder folder = store.getFolder("INBOX");
            // Open the Folder.

            folder.open(Folder.READ_WRITE);   
            SearchTerm st1 =new SubjectTerm("**NEW-TICKET**");
            Message[] message = folder.search(st1);


            //Message[] message = folder.getMessages();
            // Create a reply message




            for (int i = 0; i < message.length; i++) {


                System.out.println("------------ Message " + (i + 1) + " ------------");
                System.out.println("SentDate : " + message[i].getSentDate());
                System.out.println("From : " + message[i].getFrom()[0]);
                System.out.println("Subject : " + message[i].getSubject());

                if(message[i].getSubject().equals("**NEW-TICKET**")) {
                    System.out.println("new-ticket");

                    Message forward = new MimeMessage(session);

                    // Fill in header
                    forward.setSubject("Fwd: " + message[i].getSubject());
                    forward.setFrom(new InternetAddress(message[i].getFrom()[0].toString()));
                    forward.addRecipient(Message.RecipientType.TO,
                            new InternetAddress("[email protected]"));

                    // Create your new message part
                    BodyPart messageBodyPart = new MimeBodyPart();
                    messageBodyPart.setText("Oiginal message:\n\n");

                    // Create a multi-part to combine the parts
                    Multipart multipart = new MimeMultipart();
                    multipart.addBodyPart(messageBodyPart);

                    // Create and fill part for the forwarded content
                    messageBodyPart = new MimeBodyPart();
                    messageBodyPart.setDataHandler(message[i].getDataHandler());

                    // Add part to multi part
                    multipart.addBodyPart(messageBodyPart);

                    // Associate multi-part with message
                    forward.setContent(multipart);

                    System.out.println("msg forward ...."  +forward.getSubject());
                    // Send message
                    Transport.send(forward);



                }


            }

            System.out.println();       
            folder.close(true);
            store.close();

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

    }



}

Answer 1

不确定是什么原因导致您的错误。
我只是在这里大胆猜测：不要使用静态 Transport.send() 方法。
获取一个传输对象并调用它的 sendMessage) 方法：

    [...]
    Transport transport = session.getTransport("smtp");
    transport.connect(D_HOST, D_PORT, D_USER, D_PASS);
    transport.sendMessage(forward, forward.getAllRecipients());

尝试看看这是否有帮助。

干杯。