googleapi:错误400:必需的收件人地址，invalidArgument

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问题描述

我正在运行以下脚本来发送电子邮件.发件人和收件人替换了发件人和收件人地址.

I am running following script to send email message. The From and To addresses are replaced by sender and receiver.

func SendMail() {

b, err := ioutil.ReadFile("credentials.json")
if err != nil {
    log.Fatalf("Unable to read client secret file: %v", err)
}

config, err := google.ConfigFromJSON(b, gmail.MailGoogleComScope)
if err != nil {
    log.Fatalf("Unable to parse client secret file to config: %v", 
err)
}
client := getClient(config)

srv, err := gmail.New(client)
if err != nil {
    log.Fatalf("Unable to retrieve Gmail client: %v", err)
}

user := "me"
mailtext := `From: [email protected]
To: [email protected]
Subject: Saying Hello
Date: Thu, 8 Oct 2020 09:55:06 -0600
Message-ID: <[email protected]>

This is a message just to say hello.
So, "Hello".
`
raw := base64.URLEncoding.EncodeToString([]byte(mailtext))

var message gmail.Message
message.Id = "Msg 2"
message.LabelIds = []string{"SENT"}
message.Raw = raw

doFunc := srv.Users.Messages.Send(user, &message)
m, err := doFunc.Do()
if err != nil {
    println(err.Error())
    println("Message not sent")
} else {
    fmt.Printf("%+v", m)
}

该脚本报告以下错误:

googleapi: Error 400: Recipient address required, invalidArgument

环境:macOS Catalina 10.15.7 go1.15.2 darwin/amd64

Environment: macOS Catalina 10.15.7 go1.15.2 darwin/amd64

感谢帮助！

推荐答案

我相信您的目标如下.

您想使用googleapis发送电子邮件给golang.
您已经能够使用Gmail API收发电子邮件.

在您的脚本中，我认为需要修改mailtext.在这种情况下，换行和空格很重要.
尽管创建了raw，但并未将其放入请求正文中.

In your script, I think that mailtext is required to be modified. In this case, the line break and spaces are important.
Although raw is created, that is not put to the request body.

当以上几点反映到您的脚本中时，它如下所示.

When above points are reflected to your script, it becomes as follows.

    mailtext := `
    From: [email protected]
    To: [email protected]
    Subject: Saying Hello
    Date: Thu, 8 Oct 2020 09:55:06 -0600
    Message-ID: <[email protected]>

    This is a message just to say hello.
    So, "Hello".
    `
    raw :=  base64.URLEncoding.EncodeToString([]byte(mailtext))

     // create gmail.Message

     var message gmail.Message
     message.Id = "Msg 1"
     message.LabelIds = []string{"SENT"}

到:

    user := "me"
    // Modified
    mailtext := `From: [email protected]
To: [email protected]
Subject: Saying Hello
Date: Thu, 8 Oct 2020 09:55:06 -0600
Message-ID: <[email protected]>

This is a message just to say hello.
So, "Hello".`
    raw := base64.URLEncoding.EncodeToString([]byte(mailtext))

    // create gmail.Message

    var message gmail.Message
    message.Id = "Msg 1"
    message.LabelIds = []string{"SENT"}
    message.Raw = raw  // Added

我认为在这种情况下，Date:和Message-ID:可能会替换为新值.
- I think that in this case, Date: and Message-ID: might be replaced with new values.
  或者，请按如下所示修改mailtext.
  Or, please modify mailtext as follows.
```
  mailtext := "From: [email protected]\nTo: [email protected]\nSubject: Saying Hello\nDate: Thu, 8 Oct 2020 09:55:06 -0600\nMessage-ID: <[email protected]>\n\nThis is a message just to say hello.\nSo, \"Hello\"."
```