为什么.NET SmtpClient发送的电子邮件缺少Message-Id? [英] Why emails sent by .NET SmtpClient are missing Message-Id?

问题描述

这是我在App.Config中的SMTP设置:

This is my SMTP settings in App.Config:

<system.net>
    <mailSettings>
      <smtp from="Reminder &lt;[e-mail]&gt;">
        <network host="mail.myserver.net" port="587" password="my password" userName="[e-mail]" enableSsl="true"/>
      </smtp>
    </mailSettings>
  </system.net>

这就是我发送电子邮件的方式:

And this is how I'm sending the emails:

message.SubjectEncoding = System.Text.Encoding.UTF8;
message.BodyEncoding = System.Text.Encoding.UTF8;
smtpClient.Send(message);

这正在工作！但是唯一的问题是，我的电子邮件将进入垃圾邮件文件夹，这是因为它们的标头中缺少Message-Id.我在Thunderbird中使用了相同的帐户，当我使用Thunderbird发送电子邮件时，已将Message-Id添加到我的电子邮件中，但是从我的应用程序发送的电子邮件中却没有发生.

this is working ! but the only problem is, my emails are going to spam folder and that's because they are missing Message-Id in their header. I use the same account in Thunderbird, when I send emails using thunderbird the Message-Id is added to my emails but it's not happening for the emails that are sent from my application.

我可以手动添加标题，例如:

I can add the header manually with something like :

message.Headers.Add("Message-Id","<3BD50098E401463AA228377848493927-1>");

但是该ID不是有效的message-id，我仍然会收到负面的垃圾邮件评分.知道为什么会这样吗?

But this Id is not a valid message-id and I will still get negative spam score for it. Any idea why this is happening ?

这是我在雷鸟中拥有的东西:
主持人:mail.korax.net/
身份验证:普通密码/
端口:587/
安全性:STARTTLS

This is what I have in Thunderbird:
host: mail.korax.net /
authentication: normal password /
port: 587 /
security: STARTTLS

推荐答案

您的SMTP服务器必须配置为自动包含邮件ID.如果生成自己的ID，则应遵循 RFC 2822第3.6.4节.

Your SMTP server has to be configured to automatically include the message ID. If generating your own ID, it should follow RFC 2822 Section 3.6.4.

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