JavaMail 与 MS Exchange：服务器和客户端均不支持身份验证机制

我已经尝试从 Grails 应用程序发送邮件好几天了，但没有成功。我在用着：

• 圣杯 1.3.7
• 邮件1.0插件
• spring-security-core 1.2.6 插件
• 雄猫7.0.23

具体来说，我尝试从 Tomcat 服务器上部署的应用程序通过端口 25 发送邮件，无需身份验证，无需 SSL。

我尝试从部署该应用程序的 VMWare 虚拟机上使用 telnet 发送消息，但失败了。

这是我发送邮件的课程：

public boolean sendMessage(String to, String msgSubject, String msgText) 
{
    String host = "mail.mydomain.com";
    String username = "[email protected]"; // your authsmtp username
    String password = "mypassword" // your authsmtp password
    String from = "[email protected]";

    Properties props = System.getProperties();
    props.put("mail.smtp.host", host);
    props.put("mail.smtp.user", username);
    props.put("mail.smtp.password", password);
    props.put("mail.smtp.port", "25"); // thish is the port recommended by authsmtp
    props.put("mail.smtp.auth", "false");

    Session session = Session.getDefaultInstance(props, null);
    MimeMessage message = new MimeMessage(session);
    message.setFrom(new InternetAddress(from));

    InternetAddress to_address = new InternetAddress(to);
    message.addRecipient(Message.RecipientType.TO, to_address);

    message.setSubject(msgSubject);
    message.setText(msgText);
    Transport transport = session.getTransport("smtp");
    transport.connect(host, username, password);
    transport.sendMessage(message, message.getAllRecipients());
    transport.close();
    return true;
}

这是错误堆栈跟踪：

javax.mail.AuthenticationFailedException: No authentication mechansims supported by both server and client

at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:590)

at javax.mail.Service.connect(Service.java:291)

at javax.mail.Service.connect(Service.java:172)

at javax.mail.Service$connect.call(Unknown Source)

at org.helpdesk.MymailService.sendMessage(MymailService.groovy:37)

at org.helpdesk.MymailService$sendMessage.call(Unknown Source)

at org.helpdesk.RequestController$_closure13.doCall(RequestController.groovy:247)

at org.helpdesk.RequestController$_closure13.doCall(RequestController.groovy)

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

at java.lang.Thread.run(Unknown Source)

我已经阅读了几十篇考虑此类问题的帖子，但我仍然没有设法解决问题。任何帮助表示赞赏。

*EDIT:*在没有身份验证的情况下，使用 javaMail 与 Exchange 服务器 SMTP 发送邮件是否可能会出现一些问题？

就我而言，我必须设置属性

"mail.smtp.ehlo"

to "false"

（除了添加设置属性"mail.smtp.auth" to "false"然而，这似乎是默认值这个链接)

设置前"mail.smtp.ehlo" to "false"我看到以下调试输出（通过设置属性启用"mail.debug" to "true"):

DEBUG SMTP: Attempt to authenticate using mechanisms: LOGIN PLAIN DIGEST-MD5 NTLM 
DEBUG SMTP: mechanism LOGIN not supported by server
DEBUG SMTP: mechanism PLAIN not supported by server
DEBUG SMTP: mechanism DIGEST-MD5 not supported by server
DEBUG SMTP: mechanism NTLM not supported by server

然后得到相同的javax.mail.AuthenticationFailedException.

（在本例中，SMTP 服务器是 Microsoft 的服务器）