From: sender@test.invalid
To: recipient@test.invalid
Subject: base64 encoded UTF-16 body
Message-ID: <base64-utf16@test.invalid>
Date: Fri, 18 Sep 2026 12:00:00 +0300
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-16
Content-Transfer-Encoding: base64

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