Comment 5 for bug 266230

The following patch will avoid the problem with these and any similarly defective messages

=== modified file 'Mailman/Handlers/MimeDel.py'
--- Mailman/Handlers/MimeDel.py 2007-10-05 02:52:04 +0000
+++ Mailman/Handlers/MimeDel.py 2009-04-18 20:51:55 +0000
@@ -1,4 +1,4 @@
-# Copyright (C) 2002-2007 by the Free Software Foundation, Inc.
+# Copyright (C) 2002-2009 by the Free Software Foundation, Inc.
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License
@@ -183,7 +183,7 @@
             try:
                 firstalt = subpart.get_payload(0)
                 newpayload.append(firstalt)
- except IndexError:
+ except (IndexError, TypeError):
                 pass
         else:
             newpayload.append(subpart)