非标准Gmail Java消息传递异常

我使用Java邮件Api发送邮件，它在我的计算机系统上运行得非常好。但它在客户端网络上不起作用。。我收到Java消息异常无法连接到

下面是代码的一部分

private static void sendmail(String file) throws IOException
{
        try {
            final String username ="username";
            final String password= "password";

            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 = Session.getInstance(props,
            new javax.mail.Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(username, password);
                        }
                    });

          Message message= new MimeMessage(session);
          String To= "a@client.com";
          String subject= "ERROR LOG IN EXCEL";
          String body= "Testing Attached within";
          message.setFrom(new InternetAddress(username));
          message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(To));
          message.setSubject(subject);
          message.setText(body);
          MimeBodyPart messageBodyPart = new MimeBodyPart();
          Multipart multipart = new MimeMultipart();
          DataSource source = new FileDataSource(file);
          messageBodyPart.setDataHandler(new DataHandler(source));
          messageBodyPart.setFileName("eror log.xls");
          multipart.addBodyPart(messageBodyPart);
          message.setContent(multipart);

          Transport.send(message);
          JOptionPane.showMessageDialog(null, "message sent");      

    }

我收到错误Java消息传递异常cannot mail.smtp。主机smtp.gmail.com端口：465

然而，这在我自己的系统上起作用。电子邮件发送成功

这可能是客户端网络系统的安全配置问题

请尝试以下操作：

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 = "abcd@gmail.com";

      // Sender's email ID needs to be mentioned
      String from = "web@gmail.com";

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

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

      // Setup mail server
      properties.setProperty("mail.smtp.host", host);

      // 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();
      }
   }
}

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您需要使用堆栈跟踪复制完整异常，以便任何人都能提供帮助。客户端防火墙可能会阻止出站连接。有关如何测试防火墙是否阻塞的信息，请参见……另请参见以下内容。