Content-Type: multipart/mixed; boundary="------------nq8WTMHkJcymWO6pWfby0uY3"
To: "Receiver" <receiver@pm.me>
From: "Sender" <sender@pm.me>
Subject: Test with cyrillic attachment

--------------nq8WTMHkJcymWO6pWfby0uY3
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit

Shake that body
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--------------nq8WTMHkJcymWO6pWfby0uY3--