Return-Path: <maya@brightside.example>
Received: from list.example (list.example [203.0.113.40])
	by mx1.meridiansupply.example with ESMTPS id p7aa03;
	Tue, 17 Feb 2026 08:15:03 -0800
Authentication-Results: mx1.meridiansupply.example;
	spf=pass smtp.mailfrom=list.example;
	dkim=fail header.d=brightside.example;
	dmarc=fail (p=NONE) header.from=brightside.example
Received: from mta.brightside.example (mta.brightside.example [203.0.113.7])
	by list.example with ESMTPS id p7aa03b;
	Tue, 17 Feb 2026 08:14:41 -0800
Authentication-Results: list.example;
	spf=pass smtp.mailfrom=brightside.example;
	dkim=pass header.d=brightside.example header.s=feb2026;
	dmarc=pass (p=NONE) header.from=brightside.example
Authentication-Results: mta.brightside.example; auth=pass (PLAIN) smtp.auth=maya@brightside.example
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=brightside.example; s=feb2026; t=1771200000;
	h=from:to:subject:date:message-id;
	bh=SAMPLEbodyHashBase64Placeholder0000000000000=;
	b=SAMPLEsignatureBase64Placeholder00000000000000000000000000000000/NOTREAL=
From: Maya Chen <maya@brightside.example>
To: Sam Rivera <sam@meridiansupply.example>
Subject: Mailing-list post seen by three hops
Date: Tue, 17 Feb 2026 08:15:00 -0800
Message-ID: <p7-auth-hops@brightside.example>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit

The authentication headers are the fixture; the body is filler.
Every DKIM and ARC value in this message is a visible SAMPLE placeholder
and will not verify against any key.