--- /usr/lib/python3.2/mailbox.py	2013-02-20 08:56:36.000000000 -0600
+++ mailbox.py	2014-08-31 19:54:05.729695174 -0500
@@ -1125,7 +1125,9 @@
     def get_sequences(self):
         """Return a name-to-key-list dictionary to define each sequence."""
         results = {}
-        f = open(os.path.join(self._path, '.mh_sequences'), 'r')
+        fname = os.path.join(self._path, '.mh_sequences')
+        if not os.path.isfile(fname): return results
+        f = open(fname, 'r')
         try:
             all_keys = set(self.keys())
             for line in f: