客户端未通过身份验证，无法在 MAIL FROM 期间发送匿名邮件

Question

我正在尝试在调用此方法的 java 应用程序中发送电子邮件：

public static void sendEmail() {

    // Create object of Property file
    Properties props = new Properties();

    // this will set host of server- you can change based on your requirement 
    props.put("mail.smtp.host", "smtp.office365.com");

    // set the port of socket factory 
    //props.put("mail.smtp.socketFactory.port", "587");

    // set socket factory
    //props.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");

    // set the authentication to true
    props.put("mail.smtp.auth", "true");

    // set the port of SMTP server
    props.put("mail.smtp.port", "587");

    // This will handle the complete authentication
    Session session = Session.getDefaultInstance(props,

            new javax.mail.Authenticator() {

                protected PasswordAuthentication getPasswordAuthentication() {

                return new PasswordAuthentication("xx@mail.com", "xx");


                }

            });

    try {

        // Create object of MimeMessage class
        Message message = new MimeMessage(session);

        // Set the from address
        message.setFrom(new InternetAddress("xx@mail.com"));

        // Set the recipient address
        message.setRecipients(Message.RecipientType.TO,InternetAddress.parse("yy@mail.com"));

                    // Add the subject link
        message.setSubject("Testing Subject");

        // Create object to add multimedia type content
        BodyPart messageBodyPart1 = new MimeBodyPart();

        // Set the body of email
        messageBodyPart1.setText("This is message body");

        // Create object of MimeMultipart class
        Multipart multipart = new MimeMultipart();

        // add body part 2
        multipart.addBodyPart(messageBodyPart1);

        // set the content
        message.setContent(multipart);

        // finally send the email
        Transport.send(message);

        System.out.println("=====Email Sent=====");

    } catch (MessagingException e) {

        throw new RuntimeException(e);

    }

}

但由于某种原因，当调试命中 Transport.send() 时，我得到了这个异常：

com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM [DB6PR0802CA0037.eurprd08.prod.outlook.com]

为什么即使我使用了 Authenticator() 也会发生这种情况？

Answer 1

如果您通过端口 587 连接，您最初会启动一个普通连接，您必须通过显式发送 STARTTLS-command 来启动 TLS。您必须告诉 JavaMail 这样做，否则它将尝试不安全地进行。除非建立 TLS-connection，否则 SMTP-server 不会发送任何 authentication-mechanism-informations，因此 JavaMail 假设不需要身份验证并尝试在没有身份验证的情况下发送邮件。

将以下条目添加到属性中：

props.put("mail.smtp.starttls.enable", "true");

JavaMail 应该在尝试验证之前尝试切换到 TLS。

如果失败，您需要通过设置属性

来启用调试

props.put("mail.debug", "true");

和post这里的输出。

客户端未通过身份验证，无法在 MAIL FROM 期间发送匿名邮件

Client was not authenticated to send anonymous mail during MAIL FROM

java

smtp

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