Verified via DoH: _dmarc.axion1337.de is p=reject (sorb changed it), subdomains inherit reject with sp= absent per RFC 7489, and the noted DKIM gap was a false alarm — IONOS uses s1-ionos/s2-ionos/s42582890 selectors, all present with valid keys. Apex SPF left at ~all deliberately: real mail flows over the apex and DMARC already enforces reject, so -all adds little while risking silent send breakage. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>