如何使用 javax.mail 设置或更改 SMTP 消息 ID?

问题描述

如何在使用 javax.mail 发送邮件时设置 SMTP 消息 ID.我的邮件服务器报告如下内容:

How can I set the SMTP message-id while sending mails with javax.mail. My mail server is reporting something like this:

1 <= me@domain.com H=mail (host) [192.168.1.4] P=esmtp S=142014
     id=2043289758.9.1322829290422.JavaMail.thor@developer.local
2 => sombodey@else R=dnslookup T=remote_smtp H=mx00.t-online.de [194.25.134.8]
3 Completed

我想在发送之前设置 id=2043289758.9.1322829290422.JavaMail.thor@developer.local.这可能吗?它创建的电子邮件是这样的:

I want to set the id=2043289758.9.1322829290422.JavaMail.thor@developer.local before sending it. Is this possible? The email it created like this:

Properties props = System.getProperties();
props.put("mail.smtp.host", "192.168.1.4");
Session session = Session.getDefaultInstance(props, null);
session.setDebug(false);
Message msg = createMsg();
Transport.send(msg);

推荐答案

相信这一段JavaMail 常见问题解答 回答您的问题:

I believe this section of the JavaMail FAQ answers your question:

问:我为我的新消息的 Message-ID 标头设置了一个特定值，但是当我发送此消息时，标头被重写.

Q: I set a particular value for the Message-ID header of my new message, but when I send this message that header is rewritten.

答: 在调用 saveChanges 方法时会为 Message-ID 字段设置一个新值(通常在消息被已发送)，覆盖您自己设置的任何值.如果您需要设置您的拥有 Message-ID 并保留它，您必须创建自己的MimeMessage 子类，覆盖 updateMessageID 方法并使用这个子类的实例.

A: A new value for the Message-ID field is set when the saveChanges method is called (usually implicitly when a message is sent), overwriting any value you set yourself. If you need to set your own Message-ID and have it retained, you will have to create your own MimeMessage subclass, override the updateMessageID method and use an instance of this subclass.

class MyMessage extends MimeMessage {
    ...

    protected void updateMessageID() throws MessagingException {
  setHeader("Message-ID", "my-message-id");
    }
    ...
}

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