From: =?invalid-charset?Q?Br=F6tchen?= <bad@example.com>
To: mcptest@local
Subject: =?x-unknown?B?a2FwdXR0?= BADHEADERTOKEN
Date: Fri, 05 Jul 2013 09:00:00 +0200
Content-Type: text/plain; charset=utf-8

Body BADHEADERTOKEN.