DKIM2 and DMARCbis have landed, and Stalwart speaks them first
Summary
DKIM2 and DMARCbis have landed, with Stalwart implementing these protocols and offering a browser playground and Rust library. The article explains how DKIM2 creates a verifiable chain of custody across hops, how DMARCbis replaces the Public Suffix List with a live DNS tree walk, and the implications for bounce handling, reporting, and policy enforcement. It also compares DKIM1/ARC and outlines practical guidance for operators and developers.