이메일에 메시지 본문을 표시하지 않는 패키지 smtp로 이동

func randomstringbytes() string {
    
    rand.seed(time.now().unixnano())
    number := []byte("0123456789abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")
    
    b := make([]byte, 6)
    
    for i := range b{
      b[i] =  number[rand.intn(len(number))] 
    }
    
      return string(b)
}
  
func sendemail(to string, code string) error {
    from := "xxx"
    password := "xxx"
    smptserver := "smtp.gmail.com:587"
    subject := "verification code"
    body := "your verification code is: "+code

    message := "from: "+ from + "\n" +
    "to: " + to + "\n" +
    "subject: " + subject + "\n" +
    body
    
    auth := smtp.plainauth("", from, password, "smtp.gmail.com")

    return smtp.sendmail(smptserver, auth, from, []string{to}, []byte(message))
}