From: Recipient <optout@example.com>
To: sender@example.com
Subject: Please unsubscribe me
Date: Tue, 02 Jun 2026 10:08:00 +0000
Message-ID: <unsubscribe@example.com>
Content-Type: text/plain; charset=utf-8

Please unsubscribe optout@example.com from future messages. Remove me from this list.