Question

这段代码是从http://www.tutorialspoint.com/javamail_api/javamail_api_sending_simple_email.htm

中选取的

//package com.tutorialspoint;

import java.util.Properties;

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

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

        // Sender's email ID needs to be mentioned
        String from = "PQR@gmail.com";
        final String username = "NAME";
        final String password = "****";

        // Assuming you are sending email through relay.jangosmtp.net
        String host = "relay.jangosmtp.net";

        Properties props = new Properties();
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.port", "25");

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

        try {
            // Create a default MimeMessage object.
            Message message = new MimeMessage(session);

            // Set From: header field of the header.
            message.setFrom(new InternetAddress(from));

            // Set To: header field of the header.
            message.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse(to));

            // Set Subject: header field
            message.setSubject("Testing Subject");

            // Now set the actual message
            message.setText("Hello, this is sample for to check send "
                    + "email using JavaMailAPI ");

            // Send message
            Transport.send(message);

            System.out.println("Sent message successfully....");

        } catch (MessagingException e) {
            throw new RuntimeException(e);
        }
    }
}

我尝试从this链接获取提示。但它似乎使用了略有不同的方法。

在使用调试器运行它时，异常似乎来自以下代码：

Transport.send(message);

以下是堆栈跟踪：

at com.sun.mail.smtp.SMTPTransport$Authenticator.authenticate(SMTPTransport.java:809)
at com.sun.mail.smtp.SMTPTransport.authenticate(SMTPTransport.java:752)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:669)
at javax.mail.Service.connect(Service.java:317)
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 SendEmail.main(SendEmail.java:58)

PS：我已经检查了用户名和密码。此外，我没有为我尝试发送邮件的帐户启用2步登录过程。

有人可以解释可能导致认证失败的原因吗？或者，如果有其他帖子已经回答了查询，请指出。感谢。

Answer 1

服务器对您使用的用户名或密码不满意。您可能会猜到可能出现这种情况的常见原因，并提供错误的用户名或密码。

JavaMail Session debugging output可能会提供更多信息。

Answer 2

更改String host = "relay.jangosmtp.net";

到String host = "smtp.gmail.com";

和从25到587的端口

线程“main”中的异常java.lang.RuntimeException：javax.mail.AuthenticationFailedException：535 5.7.8认证凭证无效

2 个答案: