Quoted-Printable ? ImapClient

Добрый день.
Использую ImapClient для получения писем. Но часть писем приходит закодированными Quoted-Printable и отображаются в не читаемом виде. Это ошибка в библиотеке? Или их можно как то декодировать?
Вот текст сообщения, которое не удалось декодировать.
Content-Type: text/plain; charset="koi8-r"
Content-Transfer-Encoding: quoted-printable
Delivered-To: anton_dobrydin@mail.ru
Return-path:
Authentication-Results: mxs.mail.ru; spf=pass (mx17.mail.ru: domain of help-s.ru designates
144.76.175.133 as permitted sender) smtp.mailfrom=webmaster@help-s.ru
smtp.helo=help-s.ru
Received-SPF: pass (mx17.mail.ru: domain of help-s.ru designates 144.76.175.133 as
permitted sender) client-ip=144.76.175.133;
envelope-from=webmaster@help-s.ru; helo=help-s.ru;
Received: from help-s.ru ([144.76.175.133]:45133) by mx17.mail.ru with esmtp
(envelope-from ) id 1dKdVx-00032P-5E for
anton_dobrydin@mail.ru; Tue, 13 Jun 2017 07:33:13 +0300
To: anton_dobrydin@mail.ru
Subject: =?windows-1251?B?aGVscC1zLnJ1IC0g7/Do4+vg+OXt6OUg6iDn4Org5/MguSA1MTEyMTIyIM/w6Orr4OTt4P8g8fLg8ujx8ujq4A==?=
X-PHP-Originating-Script: 500:tools.php
From: robots@help-s.ru
Reply-To: robots@help-s.ru
X-EVENT_NAME: COME_TO_ZAKAZ
X-MID: 84278022.71 (13.06.2017 07:22:51)
Message-Id: <20170613042502.59F7E2181158@help-s.ru>
Date: Tue, 13 Jun 2017 07:25:02 +0300 (MSK)
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X-DMARC-Policy: no
X-Mras: OK
X-Spam: undefined
MIME-Version: 1.0

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Но онлайн декодер с ним справился, если передать в него сообщение без заголовков.
https://2cyr.com/decode/?lang=ru

Hi,


Please check my reply here for further assistance in this regard.
The answer is given in that correspondence. Thank you

You are welcome and please feel free to write to us in case of any further query related to the API.