diff --git a/weboob/backends/aum/backend.py b/weboob/backends/aum/backend.py
index 43694019..0d4033d5 100644
--- a/weboob/backends/aum/backend.py
+++ b/weboob/backends/aum/backend.py
@@ -26,4 +26,4 @@ class AuMBackend(Backend, ICapMessages, ICapMessagesReply):
         Backend.__init__(self, weboob)
 
     def iter_new_messages(self, thread=None):
-        pass
+        return dict().iteritems()