互联网信息的追溯分析

互联网信息的追溯分析
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我正在编写一个视频教程,旨在解密原始电子邮件消息。我在学习的过程中也做了这件事,我发现了很多信息,但有些东西很难理解。我知道这个互联网消息是由 RFC5322 格式化的,但不明白如何区分标题和正文。

我看到有很多 --_----------=_MCPart_XXXXXXXXX--。我认为 MC 代表 Mail Chimp,因为邮件来自他们,但是什么--_----------?它是标准的吗?还有两个字段“已收到:”为什么?

答案1

多用途互联网邮件扩展 (MIME),由RFC 2045制作不同的内容块。这些内容块由边界

边界在Content-Type:标题中设置。

您的邮件包含标题

内容类型:multipart/alternative;边界=“__----------=_MCPart_1894767556”

这意味着以下内容以几种替代方式呈现(它们都具有相同的内容,尽管格式不同,客户端应该选择它可以处理的最后一种,请参阅rfc2046 第 5.1.4 节),并且它使用 «_----------=_MCPart_1894767556» 边界

然后,各个部分将以两个破折号和定义的边界开始,直到最后以两个破折号、边界和两个破折号结束。

边界本身是一个随机字符串。它只需要不出现在任何内容中即可。可以有多个多部分内容,一个在另一个里面,因此重要的是不要在里面使用外部边界,并且边界字符串本身不要出现在文本中。

你会发现这些边界的生成方式不同。显然 MaiChip 代码使用“_----------=MC零件" 后面跟着一个数字。

至于其他问题:

不明白如何区分标题和正文。

标题和正文以一个空行分隔。正文从第一个空行之后开始。

另请注意,每个 MIME 部分都有自己的标头部分。我建议先从纯文本发送的邮件开始,然后再深入研究多部分邮件。

还有两个字段“已收到:”为什么?

它通过了两台服务器(而且我猜你删除了一些已接收的行,因为它也需要到达你的邮件服务器)。

答案2

我不明白如何区分标题和正文。

邮件中的第一个空行将邮件头与邮件正文分隔开。

我看到有很多 --_----------=_MCPart_XXXXXXXXX--

在邮件标题的最后一行,您会注意到:

边界=“__----------=_MCPart_1894767556”

这定义了 MIME 边界。MIME 边界用于分隔消息的每个 MIME 部分 - 例如消息的纯文本部分、消息的富文本(或 HTML)部分、每个附件等。它可以是任何字符串,但通常包含“-”字符,并且邮件客户端通常会在此放置自己的“指纹”(正如您在使用 MC 的 mail chimp 中注意到的那样)。表示 mime 部分开始的边界前面有“--”。标记 mime 部分结束的边界前面有“--”,后面也有“--”。

还有两个字段“已收到:”为什么?

邮件在发件人和收件人之间通过多个邮件服务器路由并不罕见。从下到上阅读邮件头,了解邮件在从发件人到收件人的过程中是如何通过不同的邮件服务器路由的。邮件路由通过的每个邮件服务器都会在Received:邮件头前面添加一行,显示其自己的主机名、从其接收邮件的服务器的主机名以及时间戳。

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