diff --git a/data/web/inc/functions.mailbox.inc.php b/data/web/inc/functions.mailbox.inc.php
index a2f181c4..b537467c 100644
--- a/data/web/inc/functions.mailbox.inc.php
+++ b/data/web/inc/functions.mailbox.inc.php
@@ -2361,6 +2361,14 @@ function mailbox($_action, $_type, $_data = null, $_extra = null) {
               );
               continue;
             }
+            if ((($is_now['quota_used'] / 1048576) + $quota_m) > $DomainData['quota']) {
+              $_SESSION['return'][] = array(
+                'type' => 'danger',
+                'log' => array(__FUNCTION__, $_action, $_type, $_data_log, $_attr),
+                'msg' => array('mailbox_quota_left_exceeded', ($is_now['max_new_quota'] / 1048576))
+              );
+              continue;
+            }
             if ($quota_m > $DomainData['maxquota']) {
               $_SESSION['return'][] = array(
                 'type' => 'danger',
@@ -2369,14 +2377,6 @@ function mailbox($_action, $_type, $_data = null, $_extra = null) {
               );
               continue;
             }
-            if (((($is_now['quota_used'] / 1048576) - $quota_m) + $quota_m) > $DomainData['quota']) {
-              $_SESSION['return'][] = array(
-                'type' => 'danger',
-                'log' => array(__FUNCTION__, $_action, $_type, $_data_log, $_attr),
-                'msg' => array('mailbox_quota_left_exceeded', ($is_now['max_new_quota'] / 1048576))
-              );
-              continue;
-            }
             $extra_acls = array();
             if (isset($_data['extended_sender_acl'])) {
               if (!isset($_SESSION['acl']['extend_sender_acl']) || $_SESSION['acl']['extend_sender_acl'] != "1" ) {