Copying the email package back, despite its failings.
diff --git a/Lib/email/test/data/msg_21.txt b/Lib/email/test/data/msg_21.txt
new file mode 100644
index 0000000..23590b2
--- /dev/null
+++ b/Lib/email/test/data/msg_21.txt
@@ -0,0 +1,20 @@
+From: aperson@dom.ain
+To: bperson@dom.ain
+Subject: Test
+Content-Type: multipart/mixed; boundary="BOUNDARY"
+
+MIME message
+--BOUNDARY
+Content-Type: text/plain; charset="us-ascii"
+MIME-Version: 1.0
+Content-Transfer-Encoding: 7bit
+
+One
+--BOUNDARY
+Content-Type: text/plain; charset="us-ascii"
+MIME-Version: 1.0
+Content-Transfer-Encoding: 7bit
+
+Two
+--BOUNDARY--
+End of MIME message