DKIM2 and DMARCbis have landed, and Stalwart speaks them first
Summary
DKIM2 and DMARCbis are explained, with emphasis on how they improve email authentication via chain of custody and live DNS tree walks. The article notes that Stalwart has implemented both, offers a browser playground to test signatures, and provides a Rust library for integration. It's a practical guide for admins to understand the new standards and how to test them.