java - 在java中使用gmail帐户发送邮件

Question

我尝试使用 Gmail SMTP 向任何 Gmail 帐户发送一封简单的电子邮件。出现以下错误。

javax.mail.MessagingException:无法连接到 SMTP 主机:smtp.gmail.com，端口:587；
嵌套异常是:
java.net.ConnectException:连接超时:连接

我的代码是

package common;

import java.util.Date;
import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

import com.sun.mail.smtp.SMTPMessage;

public class SimpleMail{

    /**
           Outgoing Mail (SMTP) Server
           requires TLS or SSL: smtp.gmail.com (use authentication)
           Use Authentication: Yes
           Port for SSL: 465
         */
        public static void main(String[] args) {

             String to="mymailid@gmail.com";
             String subject="New Mail";

             String msg="test test";

            final String user="gmailuser";
            final String pass="gmailpassowd";
            Properties props = new Properties();
            props.put("mail.smtp.host", "smtp.gmail.com");
            props.put("mail.smtp.port", "587"); //this is optional
            props.put("mail.smtp.auth", "true");
            props.put("mail.smtp.starttls.enable", "true");



            Session session = Session.getInstance(props,new javax.mail.Authenticator() {

                    @Override
            protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(user,pass);
           }
           });

            try {
           MimeMessage message = new MimeMessage(session);
           message.setFrom(new InternetAddress(user));
           message.addRecipient(Message.RecipientType.TO,new InternetAddress(to));
           message.setSubject(subject);
           message.setText(msg);

             Transport.send(message);
                System.out.println("Mail sent..");
       }catch(Exception e)
       {
           System.out.println(e);
       }
    }



}

Answer 1

检查您的端口。来自 Google 的支持:

If you tried configuring your SMTP server on port 465 (with SSL) and port 587 (with TLS), but are still having trouble sending mail, try configuring your SMTP to use port 25 (with SSL).

来源:https://support.google.com/mail/answer/78775?hl=en

所以，尝试使用端口 25 看看会发生什么。