将邮件发送到某个线程失败，即使我设置了标题"；在回答「&&引用；参考资料； 环境 戈兰 GmailAPI（google.golang.org/api/gmail/v1） 问题

当我尝试向某个线程发送邮件时，设置了“回复”和“引用”标题，邮件无法附加到该线程

我的问题：你认为这个问题的原因是什么

信头 这里我附上邮件的标题

Received: from 487462728342 named unknown by gmailapi.google.com with HTTPREST; Thu, 19 Nov 2020 22:34:45 -0800
In-Reply-To: <CAMZJxVNx_GfH3mryUr78WD_N6ayz__H3=x7zTocOrWzbo+kcnA@mail.gmail.com>
References: <CAMZJxVM8vEEeuMzzMUbVirk-Mx554putqNs=HyxikWGPSy-Ayw@mail.gmail.com> <CAMZJxVNx_GfH3mryUr78WD_N6ayz__H3=x7zTocOrWzbo+kcnA@mail.gmail.com>
X-Tracking-Address: hogehoge@gmail.com
Subject: Re: Hello
To: moriwm77@gmail.com
CC: hogehoge@gmail.com
BCC: 
Content-Type: multipart/mixed; boundary="===============1605854084=="
Date: Thu, 19 Nov 2020 22:34:45 -0800
Message-Id: <CAMZJxVPX-6dZyNy2cSu3eAUMUZ4p-ai62uOH6=MZY7LYq6O5Lg@mail.gmail.com>
From: moriwm77@gmail.com

--===============1605854084==
Content-Type: text/plain; charset="utf-8"

If...

--===============1605854084==--

“回复”标题和“参考”标题包含在“m.Headers”中。 像

m.Headers[“回复”]
// => 
m、 标题[“参考”]
// =>  

根据，如果要向线程添加草稿或消息，必须满足以下条件：

请求的

threadId

必须在您随请求提供的消息或草稿中指定

必须按照RFC 2822标准设置回复标题的

参考

和

主题

标题必须匹配

因此，必须指定

threadId

，才能成功插入消息

参考文献

---

欢迎使用stack，请编辑您的问题并包含您的代码。如果没有看到您的代码，我们无法帮助您确定错误。您可以发布您正在使用的代码吗？此外，您在提出请求时是否收到任何错误？谢谢您的快速回复！我添加了我的代码@我没有收到任何错误。我只是在执行代码后发现邮件没有线程化。此外，我还发现邮件在其他邮件客户端（如Spark或mail（OSX））上被正确线程化。看起来它们并不仅仅是Gmail客户端的线程。因此，我想我的代码已经满足RFC2822。我怀疑，除了RFC2822之外，Gmail对邮件线程也有特殊要求。

// SendMail send gmail.
func (api *GSuiteAPI) SendMail(token *oauth2.Token, m Message) error {
    ctx := context.Background()
    srv, err := gmail.NewService(ctx, option.WithTokenSource(api.config.TokenSource(ctx, token)))
    if err != nil {
        return handleError(err)
    }

    boundary := "===============" + strconv.FormatInt(time.Now().Unix(), 10) + "=="

    sMail := []string{}
    for key, value := range m.Headers {
        sMail = append(sMail, key+": "+value)
    }
    sMail = append(sMail, "Subject: =?UTF-8?B?"+base64.StdEncoding.EncodeToString([]byte(m.Subject))+"?=")
    sMail = append(sMail, "To: "+strings.Join(m.To, ","))
    sMail = append(sMail, "CC: "+strings.Join(m.CC, ","))
    sMail = append(sMail, "BCC: "+strings.Join(m.BCC, ","))
    sMail = append(sMail, "Content-Type: multipart/mixed; boundary=\""+boundary+"\"")

    // Boby
    sMail = append(sMail, "")
    sMail = append(sMail, "--"+boundary)
    sMail = append(sMail, "Content-Type: text/plain; charset=\"utf-8\"")
    sMail = append(sMail, "")
    sMail = append(sMail, m.Body)

    log.Info().Msgf("%+v", strings.Join(sMail, "\r\n"))

    // Attachment
    for _, attachment := range m.Attachments {
        name := strings.Replace(attachment.Name, "\"", "", -1)
        sMail = append(sMail, "")
        sMail = append(sMail, "--"+boundary)
        sMail = append(sMail, "Content-Type: application/octet-stream; name=\""+name+"\"")
        sMail = append(sMail, "Content-Disposition: attachment; filename=\""+name+"\"")
        sMail = append(sMail, "Content-Transfer-Encoding: Base64")
        sMail = append(sMail, "")
        sMail = append(sMail, attachment.Data)
    }

    source := strings.Join(sMail, "\r\n")

    var message gmail.Message

    if api.mailConfig.Enable {
        message.Raw = base64.
            StdEncoding.
            EncodeToString([]byte(source))
        _, err = srv.Users.Messages.Send("me", &message).Do()
        if err != nil {
            return handleError(err)
        }
    }

    return nil
}

m.Headers["In-Reply-To"]
// => <CAMZJxVNx_GfH3mryUr78WD_N6ayz__H3=x7zTocOrWzbo+kcnA@mail.gmail.com>

m.Headers["References"]
// => <CAMZJxVM8vEEeuMzzMUbVirk-Mx554putqNs=HyxikWGPSy-Ayw@mail.gmail.com> <CAMZJxVNx_GfH3mryUr78WD_N6ayz__H3=x7zTocOrWzbo+kcnA@mail.gmail.com>