diff -bu -r email/errors.py email.patch//errors.py
--- email/errors.py	2011-06-11 17:46:24.000000000 +0200
+++ email.patch//errors.py	2011-07-27 18:00:31.512711690 +0200
@@ -44,6 +44,9 @@
 class StartBoundaryNotFoundDefect(MessageDefect):
     """The claimed start boundary was never found."""
 
+class CloseBoundaryNotFoundDefect(MessageDefect):
+    """The claimed start boundary was never found."""
+    
 class FirstHeaderLineIsContinuationDefect(MessageDefect):
     """A message had a continuation line as its first header line."""
 
diff -bu -r email/feedparser.py email.patch//feedparser.py
--- email/feedparser.py	2011-06-11 17:46:24.000000000 +0200
+++ email.patch//feedparser.py	2011-07-27 18:00:31.512711690 +0200
@@ -304,6 +304,7 @@
             capturing_preamble = True
             preamble = []
             linesep = False
+            is_boundary_closed = False
             while True:
                 line = self._input.readline()
                 if line is NeedMoreData:
@@ -318,6 +319,7 @@
                     # the closing boundary, then we need to initialize the
                     # epilogue with the empty string (see below).
                     if mo.group('end'):
+                        is_boundary_closed = True
                         linesep = mo.group('linesep')
                         break
                     # We saw an inter-part boundary.  Were we in the preamble?
@@ -387,6 +389,10 @@
             # capturing the preamble, we never saw the start boundary.  Note
             # that as a defect and store the captured text as the payload.
             # Everything from here to the EOF is epilogue.
+            if is_boundary_closed is False:
+                self._cur.defects.append(errors.CloseBoundaryNotFoundDefect())
+                return
+            self._cur.defects.append(errors.StartBoundaryNotFoundDefect())
             if capturing_preamble:
                 self._cur.defects.append(errors.StartBoundaryNotFoundDefect())
                 self._cur.set_payload(EMPTYSTRING.join(preamble))