To: test@example.com
From: test@example.com
Subject: 17 plaintext + (HTML + embedded image)
Message-ID: <fd7a5d4a-6a3a-8b9b-b3e4-9e9391c3c703@example.com>
Date: Sat, 30 Dec 2017 19:36:00 +0100
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:59.0) Gecko/20100101
 Thunderbird/59.0a1
MIME-Version: 1.0
Content-Type: multipart/alternative;
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Content-Language: en-GB

This is a multi-part message in MIME format.
--------------77E82F0826A0A90EABD21FC3
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit

Search for hïhï


--------------77E82F0826A0A90EABD21FC3
Content-Type: multipart/related;
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--------------D719681335F2A7D71D3761B1
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: base64

PGh0bWw+DQogIDxoZWFkPg0KDQogICAgPG1ldGEgaHR0cC1lcXVpdj0iY29udGVudC10eXBl
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--------------D719681335F2A7D71D3761B1
Content-Type: image/png;
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Content-Transfer-Encoding: base64
Content-ID: <part1.8C5E6A81.D0C1B91A@example.com>
Content-Disposition: inline;
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iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAIAAACQkWg2AAAAAXNSR0IArs4c6QAAAARnQU1B
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--------------77E82F0826A0A90EABD21FC3--