From: Alice Sender <alice@example.com>
To: Bob Recipient <bob@example.org>
Subject: Test message 007 - duplicate headers
Subject: This second Subject should be ignored per RFC 6376 s3.5
Date: Thu, 01 Jan 2026 12:00:00 +0000
Message-ID: <test-007@example.com>
X-Repeat-Header: first
X-Repeat-Header: second
X-Repeat-Header: third
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8

RFC 6376 s3.5 says: when signing, the LAST occurrence of a header
is what gets signed (headers are processed bottom-up). Both signers
must agree on which X-Repeat-Header value ends up in the signature.
