diff -r b1e99b4ec374 Lib/email/parser.py
--- a/Lib/email/parser.py	Sat Jun 07 23:18:12 2014 -0700
+++ b/Lib/email/parser.py	Sun Jun 08 23:16:41 2014 +0700
@@ -106,8 +106,10 @@
         meaning it parses the entire contents of the file.
         """
         fp = TextIOWrapper(fp, encoding='ascii', errors='surrogateescape')
-        with fp:
+        try:
             return self.parser.parse(fp, headersonly)
+        finally:
+            fp.detach()
 
 
     def parsebytes(self, text, headersonly=False):
diff -r b1e99b4ec374 Lib/test/test_email/test_email.py
--- a/Lib/test/test_email/test_email.py	Sat Jun 07 23:18:12 2014 -0700
+++ b/Lib/test/test_email/test_email.py	Sun Jun 08 23:16:41 2014 +0700
@@ -3390,6 +3390,31 @@
         self.assertIsInstance(msg.get_payload(), str)
         self.assertIsInstance(msg.get_payload(decode=True), bytes)
 
+    def test_bytes_parser_does_not_close_file(self):
+        with openfile('msg_02.txt', 'rb') as fp:
+            email.parser.BytesParser().parse(fp)
+            self.assertFalse(fp.closed)
+
+    def test_bytes_parser_on_exception_does_not_close_file(self):
+        with openfile('msg_15.txt', 'rb') as fp:
+            bytesParser = email.parser.BytesParser
+            self.assertRaises(email.errors.StartBoundaryNotFoundDefect,
+                              bytesParser(policy=email.policy.strict).parse,
+                              fp)
+            self.assertFalse(fp.closed)
+
+    def test_parser_does_not_close_file(self):
+        with openfile('msg_02.txt', 'r') as fp:
+            email.parser.Parser().parse(fp)
+            self.assertFalse(fp.closed)
+
+    def test_parser_on_exception_does_not_close_file(self):
+        with openfile('msg_15.txt', 'r') as fp:
+            parser = email.parser.Parser
+            self.assertRaises(email.errors.StartBoundaryNotFoundDefect,
+                              parser(policy=email.policy.strict).parse, fp)
+            self.assertFalse(fp.closed)
+
     def test_whitespace_continuation(self):
         eq = self.assertEqual
         # This message contains a line after the Subject: header that has only