update

@@ -114,7 +114,10 @@ class SyncSubmitTaskService
     public function subscribe($data, $date, $task_id){
         $email = $data['data']['email'];
         if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
-            $model = new Email();
+            $model = Email::where('email', $email)->first();
+            if($model){
+                return true;
+            }
             $model->email = $email;
             $model->save();
         }else{