diff -r e440e94a874b -r cf4b80992451 thirdparty/google_appengine/google/appengine/api/mail_errors.py
--- a/thirdparty/google_appengine/google/appengine/api/mail_errors.py	Mon Sep 07 20:26:39 2009 +0200
+++ b/thirdparty/google_appengine/google/appengine/api/mail_errors.py	Mon Sep 07 20:27:37 2009 +0200
@@ -44,3 +44,12 @@
 
 class MissingBodyError(Error):
   """No body specified in message."""
+
+class PayloadEncodingError(Error):
+  """Unknown payload encoding."""
+
+class UnknownEncodingError(PayloadEncodingError):
+  """Raised when encoding is not known."""
+
+class UnknownCharsetError(PayloadEncodingError):
+  """Raised when charset is not known."""