邮件中的X标题代表什么？ [英] What do X-headers in mails stand for?

问题描述

我想知道电子​​邮件中的所有 X - 标题代表什么。

I'm wondering what all X- headers in e-mails stand for.

• 他们真的只是一个习惯，每个人都可以让他们起来吗？


• 他们是否记录在某个地方？我很快浏览了 RFC 5322 。


• 何时或由谁介绍？

• Are they really just a custom and everyone can make them up?
• Are they documented somewhere? I've quickly browsed RFC 5322. It does not seem to mention anything about custom headers.
• When or by whom were they introduced?

谢谢你在这个领域中的一些光线：）

Thank you for shedding some light in that field :)

推荐答案

RFC822 （ARPA Internet文本消息格式标准），以X-开头的标题不会成为部分任何标准，因此可以用于特定于应用程序的目的。

RFC822 ("Standard for the Format of ARPA Internet Text Messages") specified in sections 4.7.4 and 4.7.5 that headers beginning with "X-" would not ever be part of any standard, and thus can be used for application-specific purposes.

对于什么是值得的，最近的BCP文档 RFC6648 （在应用程序协议中弃用X前缀和类似的构造）建议在将来避免使用X-前缀，因为标准化和非标准化头部之间的区别没有很好地定义，并且尝试绘制这样的区别会失败，当常用的非标准头被采用为stan小狗。

For what it's worth, the more recent BCP document RFC6648 ("Deprecating the 'X-' Prefix and Similar Constructs in Application Protocols") recommends that the use of the "X-" prefix be avoided in the future, as the distinction between standardized and nonstandardized headers is not well defined, and attempting to draw such a distinction fails when commonly used nonstandard headers are adopted as standards.

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