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Parse email using net/mail

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使用 net/mail 解析电子邮件

Question content

I am currently using net/mail in golang to parse emails.

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))
}

This works well for plain text emails. However, when I send an email using the apple mail app that contains html, the following body is returned:

--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

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; charset=
=3Dus-ascii"></head><body style=3D"word-wrap: break-word; -webkit-nbsp-mode=
: space; line-break: after-white-space;" class=3D""><pre class=3D"" style=
=3D"color: rgb(209, 209, 209); background-color: rgb(0, 0, 0);">fn <span cl=
ass=3D"" style=3D"color: rgb(230, 97, 112); font-weight: bold;">main</span>=
<span class=3D"" style=3D"color: rgb(210, 205, 134);">(</span><span class=
=3D"" style=3D"color: rgb(210, 205, 134);">)</span> <span class=3D"" style=
=3D"color: rgb(176, 96, 176);">{</span>
  println<span class=3D"" style=3D"color: rgb(210, 205, 134);">!</span><spa=
n class=3D"" style=3D"color: rgb(210, 205, 134);">(</span><span class=3D"" =
style=3D"color: rgb(2, 208, 69);">"</span><span class=3D"" style=3D"color: =
rgb(0, 196, 196);">Hello world!</span><span class=3D"" style=3D"color: rgb(=
2, 208, 69);">"</span><span class=3D"" style=3D"color: rgb(210, 205, 134);"=
>)</span><span class=3D"" style=3D"color: rgb(176, 96, 176);">;</span>
<span class=3D"" style=3D"color: rgb(176, 96, 176);">}</span>

--Apple-Mail=3D_4A1E75FB-9514-439D-B922-8526851CA743--

When using sendgrid to send this body to myself, I receive the following email:

A similar situation occurs with attachments. How do I parse this email correctly so I can send it again to another email address?

Correct answer

If you want to reuse the email content in another email (such as a redirect), it is not enough to include the body text, you also need to include the email tag. head.

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 types (i.e. things like multipart/mixed, multipart/related, multipart/alternative) as well as boundaries that separate parts in the body of the message. If this is not a multipart body, Content-Type contains the character set that determines the text encoding used, i.e. utf-8, iso-8859-15, ...

For non-multipart bodies, 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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