2 articles
DMARCbis (RFC 9989/9990/9991) replaces RFC 7489 from 2015. Learn about DNS Tree Walk, new tags, the impact for senders and receivers, and backward compatibility.
Step-by-step guide to migrate to DMARCbis (RFC 9989): audit your config, 3-phase plan to p=reject, reading RUA reports, new t= and np= tags, deployment checklist.