gmail-api : 邮件内容格式被扭曲 (Code Lang : Go)

gmail-api : Mail content formats are getting distorted (Code Lang : Go)

我在 Go 中使用 "google.golang.org/api/gmail/v1" 发送多封内容为 HTML 的邮件。我正在使用 for 循环发送多封内容不同但类型均为 "html".

的邮件

就 API 而言,它工作正常,所有邮件都已送达。但是只有第一封邮件以正确的格式发送,即 HTML(即邮件的接收者以 HTML 格式收到邮件),其余用户收到所有格式的邮件内容为文本(因此所有 HTML 标签在邮件正文中都可见)/

我需要处理任何限制或条件才能成功吗?

请指出我做的错误。

代码片段是:

func main() {
// Get the data from the DB
recipientsList := dbRetrieval()
fmt.Println("About to call the method")

// Invoke the Loop for all the recipients
for indx := range recipientsList {
    time.Sleep(time.Second * 10)
    fmt.Println("The 3 second wait :", indx)
    tokenValueToBeUsed := requestRefreshToken(recipientsList[indx])
    if len(tokenValueToBeUsed) == 0 {
        err_uid := updateIsDeleted(recipientsList[indx].UserId)
        if err_uid {
            fmt.Println("Zero refresh token , so updated the DELETE")
        } else {
            fmt.Println("Zero refresh token  But couldnt update the DELETE ")
        }
    } else {
        secret, err := ioutil.ReadFile("client_secret.json")
        if err != nil {
            log.Printf("Error: %v", err)
        } else {
            conf, err := google.ConfigFromJSON(secret, gmail.GmailSendScope)
            if err != nil {
                log.Printf("Error: %v", err)
            } else {
                var tok oauth2.Token
                tok.AccessToken = tokenValueToBeUsed
                token := &tok
                client := conf.Client(oauth2.NoContext, token)
                gmailService, err := gmail.New(client)
                if err != nil {
                    log.Printf("Error: %v", err)
                } else {
                    var message gmail.Message

                    // For HTML
                    header := make(map[string]string)
                    header["From"] = recipientsList[indx].From_Mail
                    header["To"] = recipientsList[indx].To_Mail
                    header["Subject"] = recipientsList[indx].Title + "\r\n\r\n" + recipientsList[indx].Body + "\r\n\r\n" + recipientsList[indx].Signature + "\r\n\r\n" + recipientsList[indx].Pixel
                    header["MIME-Version"] = "1.0"
                    header["Content-Type"] = "text/html; charset=\"utf-8\""
                    header["Content-Transfer-Encoding"] = "base64"
                    var msg string
                    for k, v := range header {
                        msg += fmt.Sprintf("%s: %s\r\n", k, v)
                    }
                    message.Raw = base64.URLEncoding.EncodeToString([]byte(msg))

                    // Send the message
                    _, err_gms := gmailService.Users.Messages.Send("me", &message).Do()
                    if err_gms != nil {
                        log.Printf("Error: %v", err_gms)
                    } else {

                        err_upd := updateStatus(recipientsList[indx].UUID)
                        if err_upd {
                            fmt.Println("Message sent!")
                            //fmt.Println("The GMAIL response Object Details", gmailResponse)
                        } else {
                            fmt.Println("Message sent! But user not updated")
                        }

                    }
                }

            }

        }

    }

}

}

我不能保证,但您似乎对电子邮件字段顺序有疑问,因为 map 顺序每次都是随机的。尝试用类似的东西替换基于 map 的东西:

header := [][]string{
    {"To", recipientsList[indx].To_Mail},
    {"From", recipientsList[indx].From_Mail},
    {"MIME-Version", "1.0"},
    {"Content-Type", "text/html; charset=utf-8"},
    {"Content-Transfer-Encoding", "base64"},
    {"Subject", recipientsList[indx].Title + "\r\n\r\n" + recipientsList[indx].Body + "\r\n\r\n" + recipientsList[indx].Signature + "\r\n\r\n" + recipientsList[indx].Pixel},
}
var msg string
for _, v := range header {
    msg += fmt.Sprintf("%s: %s\r\n", v[0], v[1])
}