add mailinglists

app/UI/Client/DistributionList/Providers/AddListDataProvider.php

@@ -180,7 +180,7 @@ class AddListDataProvider extends BaseDataProvider
                 "emailAddress" => $customMember,
                 "kind" => "Member"
             );
-            array_push($paramsAddMembers = $extMember);
+            array_push($paramsAddMembers, $extMember);
         }
 
         /**