#16564: test to confirm behavior that regressed in python3.

Also add running of test_email_renamed to the email regrtest.  It contains
tests that the base email/tests/test_email.py does not, which I discovered
while trying to backport this test for confirmation of the behavior.
diff --git a/Misc/NEWS b/Misc/NEWS
index 00eb8ea..92bd686 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -748,6 +748,10 @@
 Tests
 -----
 
+- We now run both test_email.py and test_email_renamed.py when running the
+  test_email regression test.  test_email_renamed contains some tests that
+  test_email does not.
+
 - Issue #17041: Fix testing when Python is configured with the
   --without-doc-strings option.