--BOUNDARY
-Content-Type: text/plain; charset=us-ascii
To: aa@bb.org
From: cc@dd.org
Subject: ee
+MIME-Version: 1.0
+Content-Type: text/plain; charset="utf-8"
+X-MIME-Autoconverted: from us-ascii to utf-8 by test id mimedecode.py
message 1
--BOUNDARY
-Content-Type: text/plain; charset=us-ascii
To: aa@bb.org
From: cc@dd.org
Subject: ee
+MIME-Version: 1.0
+Content-Type: text/plain; charset="utf-8"
+X-MIME-Autoconverted: from us-ascii to utf-8 by test id mimedecode.py
message 2