Have MimeWriter raise a DeprecationWarning as per PEP 4 and its documentation.
diff --git a/Lib/test/test_MimeWriter.py b/Lib/test/test_MimeWriter.py
index feca163..5a20bf2 100644
--- a/Lib/test/test_MimeWriter.py
+++ b/Lib/test/test_MimeWriter.py
@@ -10,6 +10,10 @@
import unittest, sys, StringIO
from test.test_support import run_unittest
+import warnings
+warnings.filterwarnings("ignore", "the MimeWriter module is deprecated.*",
+ DeprecationWarning)
+
from MimeWriter import MimeWriter
SELLER = '''\