java - 使用 javax.mail 发送电子邮件 : the newer version of the library brings unexpected errors

Question

过去，我在程序中多次使用 javax.mail 发送电子邮件，没有任何问题。我使用的版本是1.4.5

现在我已经从这里下载了该库的最新版本(1.6.5 - 现在称为 jakarta.mail):eclipse-ee4j.github.io/mail，但我在使用它时遇到问题。这是我的代码(更改库时它不会更改):

            Properties properties = new Properties();
            properties.put("mail.transport.protocol", "smtp");
            properties.put("mail.smtp.host", host);
            properties.put("mail.smtp.port", port);
            properties.put("mail.smtp.auth", "true");
            properties.put("mail.smtp.starttls.enable", "false");

            Authenticator authenticator = new Authenticator() {
                @Override
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(username, password);
                }
            };

            Session session = Session.getDefaultInstance(properties, authenticator);    
            session.setDebug(true);        
            MimeMessage message = new MimeMessage(session);
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(cc));
            message.setFrom(new InternetAddress(sender, senderName));
            message.setSubject(oggetto);            
            message.setText(testo);

            Transport.send(message);

这是我使用“新库”发送消息时得到的结果(我已激活 session 调试):

DEBUG: setDebug: Jakarta Mail version 1.6.5
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]
DEBUG SMTP: need username and password for authentication
DEBUG SMTP: protocolConnect returning false, host=10.255.59.13, user=mmiorandi, password=<null>
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "10.255.59.13", port 25, isSSL false
220 vinfosynapp01 ESMTP
DEBUG SMTP: connected to host "10.255.59.13", port: 25
EHLO IS01.Infosyn.com
250-vinfosynapp01
250-SIZE
250-AUTH LOGIN
250 HELP
DEBUG SMTP: Found extension "SIZE", arg ""
DEBUG SMTP: Found extension "AUTH", arg "LOGIN"
DEBUG SMTP: Found extension "HELP", arg ""
DEBUG SMTP: protocolConnect login, host=10.255.59.13, user=smtp@infosyn4.loc, password=<non-null>
DEBUG SMTP: Attempt to authenticate using mechanisms: LOGIN PLAIN DIGEST-MD5 NTLM XOAUTH2 
DEBUG SMTP: Using mechanism LOGIN
DEBUG SMTP: AUTH LOGIN command trace suppressed
DEBUG SMTP: AUTH LOGIN failed
javax.mail.AuthenticationFailedException: 535 Authentication failed. Restarting authentication process.

    at com.sun.mail.smtp.SMTPTransport$Authenticator.authenticate(SMTPTransport.java:947)
    at com.sun.mail.smtp.SMTPTransport.authenticate(SMTPTransport.java:858)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:762)
    at javax.mail.Service.connect(Service.java:364)
    at javax.mail.Service.connect(Service.java:222)
    at javax.mail.Service.connect(Service.java:171)
    at javax.mail.Transport.send0(Transport.java:230)
    at javax.mail.Transport.send(Transport.java:100)
...

这是我使用“旧”的时候得到的:

DEBUG: setDebug: JavaMail version 1.4.5
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "10.255.59.13", port 25, isSSL false
220 vinfosynapp01 ESMTP
DEBUG SMTP: connected to host "10.255.59.13", port: 25

EHLO IS01.Infosyn.com
250-vinfosynapp01
250-SIZE
250-AUTH LOGIN
250 HELP
DEBUG SMTP: Found extension "SIZE", arg ""
DEBUG SMTP: Found extension "AUTH", arg "LOGIN"
DEBUG SMTP: Found extension "HELP", arg ""
DEBUG SMTP: Attempt to authenticate
DEBUG SMTP: check mechanisms: LOGIN PLAIN DIGEST-MD5 NTLM 
DEBUG SMTP: AUTH LOGIN command trace suppressed
DEBUG SMTP: AUTH LOGIN succeeded
...

我看到的第一个区别是“检查机制”:LOGIN PLAIN DIGEST-MD5 NTLM XOAUTH2 与 LOGIN PLAIN DIGEST-MD5 NTLM。 难道这就是问题所在吗？

Answer 1

当 Store 或 Transport 对象上的 connect 方法由于身份验证失败(例如，错误的用户名或密码)而失败时，会引发此异常。

尝试将端口更改为587。

也试试这个。

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

此外，如果您使用基于 Google 的网络邮件，则需要确保禁用安全性较低的应用程序。只需单击下面的链接并禁用安全设置即可。

https://www.google.com/settings/security/lesssecureapps