From: Feedback Loop <fbl@example.net>
To: abuse@example.com
Subject: Spam complaint notification
Date: Tue, 02 Jun 2026 10:04:00 +0000
Message-ID: <complaint@example.net>
Content-Type: text/plain; charset=utf-8

Feedback loop abuse report.
Final-Recipient: rfc822; complained@example.com
This is a spam complaint notification for the original message.