问题

我目前正在使用net/mail在golang中解析一封电子邮件。

import (
  "net/mail"
  "io"
  "strings"
)

func main() {
  email := "some email received"

  reader := strings.NewReader(emailInput)
  msg, err := mail.ReadMessage(inputReader)
  check(err)

  body, err := io.ReadAll(msg.Body)
  check(err)

  fmt.Println(string(body))
}

这段代码可以很好地处理纯文本邮件。但是，当我使用Apple Mail应用程序发送包含HTML的电子邮件时，返回的正文如下所示：

--Apple-Mail=3D_4A1E75FB-9514-439D-B922-8526851CA743
Content-Transfer-Encoding: 7bit
Content-Type: text/plain;
    charset=3Dus-ascii

fn main() {
  println!("Hello world!");
}


--Apple-Mail=3D_4A1E75FB-9514-439D-B922-8526851CA743
Content-Transfer-Encoding: 7bit
Content-Type: text/html;
    charset=3Dus-ascii

&lt;html&gt;&lt;head&gt;&lt;meta http-equiv=3D"Content-Type" content=3D"text/html; charset=
=3Dus-ascii"&gt;&lt;/head&gt;&lt;body style=3D"word-wrap: break-word; -webkit-nbsp-mode=
: space; line-break: after-white-space;" class=3D""&gt;&lt;pre class=3D"" style=
="color: rgb(209, 209, 209); background-color: rgb(0, 0, 0);"&gt;fn &lt;span cl=
ass="" style="color: rgb(230, 97, 112); font-weight: bold;"&gt;main&lt;/span&gt;=
&lt;span class="" style="color: rgb(210, 205, 134);"&gt;(&lt;/span&gt;&lt;span class=
="" style="color: rgb(210, 205, 134);"&gt;)&lt;/span&gt; &lt;span class="" style=
="color: rgb(176, 96, 176);"&gt;{&lt;/span&gt;
  println&lt;span class="" style="color: rgb(210, 205, 134);"&gt;!&lt;/span&gt;&lt;spa=
n class="" style="color: rgb(210, 205, 134);"&gt;(&lt;/span&gt;&lt;span class="" =
style="color: rgb(2, 208, 69);"&gt;""&lt;/span&gt;&lt;span class="" style="color: =
rgb(0, 196, 196);"&gt;Hello world!&lt;/span&gt;&lt;span class="" style="color: rgb(=
2, 208, 69);"&gt;""&lt;/span&gt;&lt;span class="" style="color: rgb(210, 205, 134);"=
&gt;)&lt;/span&gt;&lt;span class="" style="color: rgb(176, 96, 176);"&gt;;&lt;/span&gt;
&lt;span class="" style="color: rgb(176, 96, 176);"&gt;}&lt;/span&gt;&lt;/pre&gt;&lt;div cla=
ss=""&gt;&lt;br class=""&gt;&lt;/div&gt;&lt;img src="https://u26515437.ct.sendgrid.net/=
wf/open?upn=3DDIOvMy23aag1zrlqvNJSXvalij334tYGiXBPjhGDZmVFp8I6wml2yWuZJN5Gy=
bSje8vz4sPJIshSAHwJ3q0VXXT-2Bc6PQlllUxVtR29EWnCSN5hiChQAIjXAqR6Wybp-2BX4xjr=
0G6ey9dIx77zxVAowA1r-2FRITFD4Og2jn-2FC3wCWfBUGLplPfTxygFPM8q8w0tCivLExebLwa=
m7q-2Flq-2B4-2FZM1Ekzac-2BOWr4XOH8pFo9-2B4-3D" alt="" width="1" height=
="1" border="0" style="height:1px !important;width:1px !important;bor=
der-width:0 !important;margin-top:0 !important;margin-bottom:0 !important;m=
argin-right:0 !important;margin-left:0 !important;padding-top:0 !important;=
padding-bottom:0 !important;padding-right:0 !important;padding-left:0 !impo=
rtant;"/>&lt;/body&gt;&lt;/html&gt;
--Apple-Mail=3D_4A1E75FB-9514-439D-B922-8526851CA743--

当我使用SendGrid将这个正文发送给自己时，我收到了以下电子邮件：

类似的情况也会发生在附件上。我应该如何正确解析这封电子邮件，以便可以将其发送给另一个电子邮件地址？

英文:

I'm currently parsing an email using net/mail in golang.

import (
  &quot;net/mail&quot;
  &quot;io&quot;
  &quot;strings&quot;
)

func main() {
  email := &quot;some email received&quot;

  reader := strings.NewReader(emailInput)
  msg, err := mail.ReadMessage(inputReader)
  check(err)

  body, err := io.ReadAll(msg.Body)
  check(err)

  fmt.Println(string(body))
}

This works fine for plain text emails. But when I send an email using the Apple Mail app containing html, the following body was returned:

--Apple-Mail=3D_4A1E75FB-9514-439D-B922-8526851CA743
Content-Transfer-Encoding: 7bit
Content-Type: text/plain;
	charset=3Dus-ascii

fn main() {
  println!(&quot;Hello world!&quot;);
}


--Apple-Mail=3D_4A1E75FB-9514-439D-B922-8526851CA743
Content-Transfer-Encoding: 7bit
Content-Type: text/html;
	charset=3Dus-ascii

&lt;html&gt;&lt;head&gt;&lt;meta http-equiv=3D&quot;Content-Type&quot; content=3D&quot;text/html; charset=
=3Dus-ascii&quot;&gt;&lt;/head&gt;&lt;body style=3D&quot;word-wrap: break-word; -webkit-nbsp-mode=
: space; line-break: after-white-space;&quot; class=3D&quot;&quot;&gt;&lt;pre class=3D&quot;&quot; style=
=3D&quot;color: rgb(209, 209, 209); background-color: rgb(0, 0, 0);&quot;&gt;fn &lt;span cl=
ass=3D&quot;&quot; style=3D&quot;color: rgb(230, 97, 112); font-weight: bold;&quot;&gt;main&lt;/span&gt;=
&lt;span class=3D&quot;&quot; style=3D&quot;color: rgb(210, 205, 134);&quot;&gt;(&lt;/span&gt;&lt;span class=
=3D&quot;&quot; style=3D&quot;color: rgb(210, 205, 134);&quot;&gt;)&lt;/span&gt; &lt;span class=3D&quot;&quot; style=
=3D&quot;color: rgb(176, 96, 176);&quot;&gt;{&lt;/span&gt;
  println&lt;span class=3D&quot;&quot; style=3D&quot;color: rgb(210, 205, 134);&quot;&gt;!&lt;/span&gt;&lt;spa=
n class=3D&quot;&quot; style=3D&quot;color: rgb(210, 205, 134);&quot;&gt;(&lt;/span&gt;&lt;span class=3D&quot;&quot; =
style=3D&quot;color: rgb(2, 208, 69);&quot;&gt;&quot;&lt;/span&gt;&lt;span class=3D&quot;&quot; style=3D&quot;color: =
rgb(0, 196, 196);&quot;&gt;Hello world!&lt;/span&gt;&lt;span class=3D&quot;&quot; style=3D&quot;color: rgb(=
2, 208, 69);&quot;&gt;&quot;&lt;/span&gt;&lt;span class=3D&quot;&quot; style=3D&quot;color: rgb(210, 205, 134);&quot;=
&gt;)&lt;/span&gt;&lt;span class=3D&quot;&quot; style=3D&quot;color: rgb(176, 96, 176);&quot;&gt;;&lt;/span&gt;
&lt;span class=3D&quot;&quot; style=3D&quot;color: rgb(176, 96, 176);&quot;&gt;}&lt;/span&gt;&lt;/pre&gt;&lt;div cla=
ss=3D&quot;&quot;&gt;&lt;br class=3D&quot;&quot;&gt;&lt;/div&gt;&lt;img src=3D&quot;https://u26515437.ct.sendgrid.net/=
wf/open?upn=3DDIOvMy23aag1zrlqvNJSXvalij334tYGiXBPjhGDZmVFp8I6wml2yWuZJN5Gy=
bSje8vz4sPJIshSAHwJ3q0VXXT-2Bc6PQlllUxVtR29EWnCSN5hiChQAIjXAqR6Wybp-2BX4xjr=
0G6ey9dIx77zxVAowA1r-2FRITFD4Og2jn-2FC3wCWfBUGLplPfTxygFPM8q8w0tCivLExebLwa=
m7q-2Flq-2B4-2FZM1Ekzac-2BOWr4XOH8pFo9-2B4-3D&quot; alt=3D&quot;&quot; width=3D&quot;1&quot; height=
=3D&quot;1&quot; border=3D&quot;0&quot; style=3D&quot;height:1px !important;width:1px !important;bor=
der-width:0 !important;margin-top:0 !important;margin-bottom:0 !important;m=
argin-right:0 !important;margin-left:0 !important;padding-top:0 !important;=
padding-bottom:0 !important;padding-right:0 !important;padding-left:0 !impo=
rtant;&quot;/&gt;&lt;/body&gt;&lt;/html&gt;
--Apple-Mail=3D_4A1E75FB-9514-439D-B922-8526851CA743--

And when sending this body to myself using SendGrid, I get the following email:

Something similar will happen for attachements. How do I properly parse this email so I can send it again to another email-address?

答案1

得分: 1

如果您想在另一封邮件中重用消息内容（例如使用重定向），仅包含正文是不够的，您还需要包含邮件头部。

具体来说，您至少需要包含原始的Content-Type头部，该头部显示了如何解释正文。在您的情况下，它包含一些multipart/*的内容类型（例如multipart/mixed、multipart/related、multipart/alternative）和分隔邮件正文中各个部分的边界。如果这不是一个多部分正文，则Content-Type包含字符集，该字符集确定所使用的文本编码，例如utf-8、iso-8859-15等。

对于非多部分正文，您还需要包含原始的Content-Transfer-Encoding头部，该头部确定正文在传输过程中的编码方式，例如base64、quoted-printable、7bit等。

英文:

If you want to reuse a message content in another mail (like with a redirect) it is not enough to include the body but you also need to include the mail header too.

Specifically you need to include at least the original Content-Type header, which shows how the body should be interpreted. In your case it contains some multipart/* content-type (i.e. something like multipart/mixed, multipart/related, multipart/alternative) and the boundary which separates the parts in the mail body. If this is not a multipart body the Content-Type contains the charset, which determines the text encoding used, i.e. utf-8, iso-8859-15, ....

For a non-multipart body you also need to include the original Content-Transfer-Encoding header which determines how the body is encoded for transfer, i.e. base64, quoted-printable, 7bit, ...

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