Update email.go

common/email.go

@@ -7,10 +7,40 @@ import (
 	"net/smtp"
 	"strings"
 )
+type loginAuth struct {
+    username, password string
+}
+
+func LoginAuth(username, password string) smtp.Auth {
+    return &loginAuth{username, password}
+}
+
+
+func (a *loginAuth) Start(server *smtp.ServerInfo) (string, []byte, error) {
+    return "LOGIN", []byte(a.username), nil
+}
+
+
+func (a *loginAuth) Next(fromServer []byte, more bool) ([]byte, error) {
+    if more {
+        switch string(fromServer) {
+        case "Username:":
+            return []byte(a.username), nil
+        case "Password:":
+            return []byte(a.password), nil
+        default:
+            return nil, errors.New("Unknown from server")
+        }
+    }
+    return nil, nil
+}
 
 func SendEmail(subject string, receiver string, content string) error {
 	if SMTPFrom == "" { // for compatibility
 		SMTPFrom = SMTPAccount
+	}
+	tlsconfig := &tls.Config {
+    ServerName: host,
 }
 	encodedSubject := fmt.Sprintf("=?UTF-8?B?%s?=", base64.StdEncoding.EncodeToString([]byte(subject)))
 	mail := []byte(fmt.Sprintf("To: %s\r\n"+
@@ -18,7 +48,8 @@ func SendEmail(subject string, receiver string, content string) error {
 		"Subject: %s\r\n"+
 		"Content-Type: text/html; charset=UTF-8\r\n\r\n%s\r\n",
 		receiver, SystemName, SMTPFrom, encodedSubject, content))
-	auth := smtp.PlainAuth("", SMTPAccount, SMTPToken, SMTPServer)
+
+	//auth := smtp.PlainAuth("", SMTPAccount, SMTPToken, SMTPServer)
 	addr := fmt.Sprintf("%s:%d", SMTPServer, SMTPPort)
 	to := strings.Split(receiver, ";")
 	var err error
@@ -34,6 +65,14 @@ func SendEmail(subject string, receiver string, content string) error {
 		client, err := smtp.NewClient(conn, SMTPServer)
 		if err != nil {
 			return err
+		}
+			if err = client.StartTLS(tlsconfig); err != nil {
+    return err
+}
+		auth := LoginAuth(SMTPAccount, SMTPToken) 
+
+if err = client.Auth(auth); err != nil {
+    return err
 }
 		defer client.Close()
 		if err = client.Auth(auth); err != nil {