diff --git a/application/MaintenanceNotification/MaintenanceNotification.php b/application/MaintenanceNotification/MaintenanceNotification.php
index bcaff1997..6bff72170 100644
--- a/application/MaintenanceNotification/MaintenanceNotification.php
+++ b/application/MaintenanceNotification/MaintenanceNotification.php
@@ -347,6 +347,7 @@ class MaintenanceNotification extends mfBaseModel {
 
     public static function searchActive($filter, $limit = false, $order = false) {
         $filter["to>"] = date("U");
+        $filter["sent"] = false;
 
         return self::search($filter, $limit, $order);
     }
@@ -409,7 +410,15 @@ class MaintenanceNotification extends mfBaseModel {
                 $where .= " AND MaintenanceNotification.to >= $to";
             }
         }
-        
+
+        if(array_key_exists("sent", $filter)) {
+            $sent = $filter['sent'];
+            if($sent === true) {
+                $where .= " AND MaintenanceNotification.sent > 0";
+            } elseif($sent === false || $sent === null) {
+                $where .= " AND (MaintenanceNotification.sent IS NULL OR MaintenanceNotification.sent = 0)";
+            }
+        }