I don't expect test_email_codecs to run on Windows.
diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index 826ac60..b5ae97b 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -489,6 +489,7 @@
         test_curses
         test_dbm
         test_dl
+        test_email_codecs
         test_fcntl
         test_fork1
         test_gdbm