Date: Tue, 4 Dec 2018 15:23:22 +0900
From: from@example.org
Subject: =?cp932?Q?=82=b1=82=b1=82=c9=96=7b=95=b6=82=aa=82=ab=82=dc=82=b7=81=42?=
To: to@example.org
Message-Id: <424F4F74-05B4-4575-8B0D-473334183C69@example.org>
Mime-Version: 1.0 (1.0)
Content-Type: text/plain; charset=cp932
Content-Transfer-Encoding: 8bit

ここに本文がきます。