--- /usr/lib/mailman/pythonlib/email/Charset.py	2006-06-13 03:43:49.000000000 +0000
+++ Charset.py	2010-06-09 15:39:32.000000000 +0000
@@ -279,7 +279,7 @@
     def convert(self, s):
         """Convert a string from the input_codec to the output_codec."""
         if self.input_codec <> self.output_codec:
-            return unicode(s, self.input_codec).encode(self.output_codec)
+            return unicode(s, self.input_codec, errors='replace').encode(self.output_codec, 'replace')
         else:
             return s