MIME-Version: 1.0
Content-Type: message/rfc822
Subject: the body is a base64 encode rfc822 message including another base64 encoded rfc822 message
Content-Transfer-Encoding: base64
MIME-Version: 1.0
Subject: a simple rfc822 message encoded in a base64 body.
Content-Type: message/rfc822
Content-Transfer-Encoding: base64
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit