<message>
<header>
<field>
Content-Type: text/plain; charset="US-ASCII"; name==?koi8-r?B?89DJ08/LLmRvYw==?=</field>
<field>
Content-Disposition: attachment; filename==?koi8-r?B?89DJ08/LLmRvYw==?=</field>
<field>
Subject: A simple subject</field>
</header>
<text-body name="russian-headers_decoded_1.txt"/>
</message>