从MIME编码的电子邮件字符串显示消息正文

时间：2019-08-06 15:06:59

标签： c# asp.net decoding mimekit

我们将停止使用Lyris ListManager帐户，但是我们仍然可以访问SQL数据库中的数据。客户仍然希望访问邮件档案，因此我们试图找到一种方法来将编码的电子邮件字符串带入数据库并在浏览器中以可读格式显示它们。一条消息的字符串示例：

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Testing.  Please reply back if successful.

Thank you


[cid:image001.jpg@01D36CBE.C035BE50]
Jane Doe | Web Content Manager
jdoe@email.com<mailto:jdoe@email.com>

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<p class=3D"MsoNormal">Thank you,<o:p></o:p></p>
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<p class=3D"MsoNormal">Jane<o:p></o:p></p>
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</span></b><span lang=3D"EN-AU" style=3D"font-size:10.0pt;font-family:&quot=
;Arial&quot;,&quot;sans-serif&quot;">|<b>
</b>Web Content Manager<br>
<a href=3D"mailto:jdoe@email.com">jdoe@email.com</a><=
/span><o:p></o:p></p>
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根据我在网上看到的一些建议，我正在尝试使用MimeKit进行解析，但是我不确定如何正确使用它。理想情况下，我们希望能够仅捕获消息正文。我尝试了以下方法：

byte[] byteArray = Encoding.UTF8.GetBytes(row["body_"].ToString());
MemoryStream stream = new MemoryStream(byteArray);
var thisMssg = MimeMessage.Load(stream);
mssg.Text = thisMssg.TextBody;

但是，这将导致“无法解析邮件头”。

我也尝试过使用QuotedPrintableDecoder：

var decoder = new QuotedPrintableDecoder();
var buffer = Encoding.ASCII.GetBytes(row["body_"].ToString());
var output = new byte[decoder.EstimateOutputLength(buffer.Length)];
int used = decoder.Decode(buffer, 0, buffer.Length, output);
mssg.Text = System.Text.Encoding.ASCII.GetString(output, 0, used));

这至少会向浏览器输出一些半可读的内容，但是在消息的上方和下方仍然有标头和编码的文本。

感谢您的帮助。我在网上看到的大多数示例都涉及对电子邮件文件进行解码。在尝试将字符串转换为字节时，我可能做错了事，或者我可能对整个事情完全不了解。

更新：这对于某些消息非常有效，但是对于其他消息，HtmlBody和TextBody均为空白。我怀疑我使用了错误的编码或类似的东西。这是不返回任何内容的消息之一的标头+正文的示例：

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SWON:  Please see information below about CEU offering from Be The Match in=
 July. Mercury SWON co-moderator:

Be sure to attend our upcoming webinar, Sickle Cell Disease: Exploring Trea=
tment Options and Psychosocial Care.<https://urldefense.proofpoint.com/v2/u=
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message body here.


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<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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QuotedPrintableDecoder方法是否需要发挥作用？我已经审查过http://www.mimekit.net/docs/html/Working-With-Messages.htm，但希望不必手动遍历每个部分，仍然有一种方法可以仅捕获消息正文。

1 个答案:

答案 0 :(得分：1)

您使用MimeKit遇到的问题为您提供了有关未能解析标头的错误，这是由于您的字符串缺少消息标头。

您正在有效地做的是让MIME解析器解析一条从消息开始到一半的消息。您正在完成一项不可能完成的任务。

在解析之前，您需要将原始消息头与上述字符串组合在一起以产生原始（完整）消息源。

要么，要么您必须伪造原始消息头，以便正确解析内容。

大概您的数据库中有原始邮件头吗？

  

QuotedPrintableDecoder方法是否需要发挥作用？我已经审查过http://www.mimekit.net/docs/html/Working-With-Messages.htm，但希望不必手动遍历每个部分，仍然有一种方法可以仅捕获消息正文。

通常不需要自己使用任何低级解码器（或编码器）。

有多种获取消息正文的方法：

  1. 手动遍历MIME树（但通常不建议这样做），但是要真正做到这一点，您确实需要了解MIME的结构以及常见的邮件客户端将如何构造其消息。除非您对MIME有所了解，否则通常不建议这样做。 （难度：极端）
  2. 使用MimeIterator。在大多数情况下，除非您想手动遍历MIME树结构而不使用任何递归方法，否则我不会为这种方法所困扰。此类真正有用的地方是，如果您要实现更类似于IMAP服务器的东西。同样，您需要了解MIME如何工作才能真正利用它。有关如何使用此功能的简单示例，请参见文档。 （难度：极端）
  3. 使用MimeVisitor子类遍历MIME树结构。有关如何执行此操作的一个很好的示例，建议您看一下文档中示例中的HtmlPreviewVisitor类。如果您想像邮件客户端一样“呈现”消息，这可能是最好的处理方式。 （难度：中等）
  4. 如果您想要的只是获取邮件正文的快速而肮脏的方式，并且您不希望尝试以与Outlook或GMail相同的方式呈现邮件，则可以使用MimeMessage.TextBody和/或MimeMessage.HtmlBody属性。 （难度：简易模式）

如果我是你，我可能会选择TextBody / HtmlBody属性，并使用类似于示例文档中的HtmlPreviewVisitor类的属性。它们将是完成您想做的最简单的方法。

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