import (
    "encoding/base64"
    "github.com/emersion/go-sasl"
    "github.com/emersion/go-smtp"
    "strings"
)
func SendSmtp(server string, from string, password string, to []string, subject string, body string) error {
    auth := sasl.NewPlainClient("", from, password)
    subjectBase := base64.StdEncoding.EncodeToString([]byte(subject))
    msg := strings.NewReader(
        "From: " + from + "\r\n" +
            "To: " + strings.Join(to, ",") + "\r\n" +
            "Subject: =?UTF-8?B?" + subjectBase + "?=\r\n" +
            "\r\n" +
            body + "\r\n")
    err := smtp.SendMail(server, auth, from, to, msg)
    if err != nil {
        return err
    }
    return nil
}