To: test@example.com
From: test@example.com
Subject: 5 HTML + embedded image
Message-ID: <c1ddcd5d-71c1-9c9d-1b81-e3b9abb99030@example.com>
Date: Sat, 30 Dec 2017 19:26:23 +0100
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:59.0) Gecko/20100101
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MIME-Version: 1.0
Content-Type: multipart/related;
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Content-Language: en-GB

This is a multi-part message in MIME format.
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Content-Transfer-Encoding: base64

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Content-Transfer-Encoding: base64
Content-ID: <part1.8C5E6A81.D0C1B91A@jorgk.com>
Content-Disposition: inline;
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