Subject: Double-signed message (RSA and Ed25519)
From: Maya Chen <[email-masked]>
To: Sam Rivera <[email-masked]>
Date: Tue, 17 Feb 2026 08:20:00 -0800

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.