golang mailbox garbled code

In recent years, with the widespread application of Go language in back-end development, more and more developers have begun to use Golang for mailbox-related processing. However, during this process, many people will encounter a common problem, which is garbled mailboxes. This article will give a brief introduction and solution to this problem.

1. What is garbled email address?

When using Golang for email processing, sometimes there will be Chinese garbled characters in attachments, or Chinese garbled characters in recipients and senders. This situation is usually caused by the default email sending method used by Golang which does not support Chinese encoding.

2. Why are there garbled email addresses?

In Golang's standard library, DefaultSender (default sender) and DefaultCharset (default encoding) are used to send emails. Since DefaultCharset defaults to US-ASCII encoding, Chinese characters cannot be converted correctly, resulting in garbled characters. At the same time, if you want to use Base64 encoding, you need to manually add relevant Header information, otherwise garbled characters will still appear.

3. How to solve the problem of garbled email?

For this problem, there are several solutions:

1. Use a third-party email sending library

If you don’t want to solve this problem yourself For processing, you can consider using a third-party email sending library, such as net/smtp and gomail. These libraries have already implemented support for Chinese encoding, which can avoid the problem of garbled characters.

2. Modify email header information

If you need to complete sending the email yourself, you can modify the relevant email header information before sending the email. The specific steps are as follows:

• Convert Chinese encoding through email.Header.

For example:

from := "发件人姓名<发件邮箱地址>"
to := "收件人姓名<收件邮箱地址>"
subject := "邮件主题"
body := "邮件内容"

header := make(map[string]string)
header["From"] = email.Header("From", from).String()
header["To"] = email.Header("To", to).String()
header["Subject"] = email.Header("Subject", subject).String()

• Use base64 to encode the email subject.

For example:

header["Subject"] = "=?UTF-8?B?" + base64.StdEncoding.EncodeToString([]byte(subject)) + "?="

• Modify the email sender and SMTP server information.

For example:

smtpServer := "smtp服务器地址"
auth := smtp.PlainAuth("", "认证邮箱地址", "认证邮箱密码", smtpServer)
smtpSender := "认证邮箱地址"

• Send email

For example:

message := ""
for k, v := range header {
    message += fmt.Sprintf("%s: %s
", k, v)
}
message += "Content-Type: text/plain; charset=UTF-8

" + body

err := smtp.SendMail(smtpServer, auth, smtpSender, []string{"收件人邮箱地址"}, []byte(message))
if err != nil {
    log.Fatal(err)
}

3. Use Golang’s mime library

If you are using Golang version 1.6 or above, you can consider using the mime library to convert email encodings. The specific steps are as follows:

• Use mime.QEncoding to convert Chinese encoding.

For example:

from := "发件人姓名<发件邮箱地址>"
to := "收件人姓名<收件邮箱地址>"
subject := "邮件主题"
body := "邮件内容"

header := make(map[string]string)
header["From"] = mime.QEncoding.Encode("UTF-8", from)
header["To"] = mime.QEncoding.Encode("UTF-8", to)
header["Subject"] = mime.QEncoding.Encode("UTF-8", subject)

• Use base64 to encode the email subject.

For example:

header["Subject"] = "=?UTF-8?B?" + base64.StdEncoding.EncodeToString([]byte(subject)) + "?="

• Modify the email sender and SMTP server information.

For example:

smtpServer := "smtp服务器地址"
auth := smtp.PlainAuth("", "认证邮箱地址", "认证邮箱密码", smtpServer)
smtpSender := "认证邮箱地址"

• Send email

For example:

message := ""
for k, v := range header {
    message += fmt.Sprintf("%s: %s
", k, v)
}
message += "Content-Type: text/plain; charset=UTF-8

" + body

err := smtp.SendMail(smtpServer, auth, smtpSender, []string{"收件人邮箱地址"}, []byte(message))
if err != nil {
    log.Fatal(err)
}

Through the above method, you can solve Golang There is a problem with garbled characters in the mailbox.

Summary:

Chinese encoding is a common problem in email sending, but there is no need to worry too much when using Golang for email processing. Through the above solutions, you can easily solve the problem of garbled characters and make your email processing more complete and professional.

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