Return-Path: <notify@mailer.example>
Received-SPF: pass (mailer.example: 203.0.113.99 is authorized) client-ip=203.0.113.99;
Authentication-Results: mx1.meridiansupply.example;
	spf=pass smtp.mailfrom=mailer.example;
	dkim=pass header.d=mailer.example header.s=relay2026;
	dmarc=fail (p=QUARANTINE sp=QUARANTINE adkim=s aspf=s) header.from=brightside.example
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mailer.example; s=relay2026; 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: Newsletter relayed by a third party
Date: Tue, 17 Feb 2026 08:10:00 -0800
Message-ID: <p7-auth-align@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.