Subject: malformed Content-Transfer-Encoding
To: lucc@github
From: test@alot
MIME-Version: 1.0;
Content-Type: text/plain; charset=iso-8859-1;
Content-Transfer-Encoding: 7bit;

This message contains a malformed header value for the "Content-Transfer-Encoding":
It should be "7bit", not "7bit;".
issue #1301