Pierre-Olivier Mercier 456cf3f97a dns: add ReturnOK check for sender domain reachability ... Verify that the From and Return-Path domains can actually receive replies and bounces, mirroring Fastmail's authentication_milter ReturnOK handler. Each domain is checked for MX records, falling back to A/AAAA (implicit MX) and then to the organizational domain, yielding a pass/warn/fail status. Adds return_ok to DNSResults, a 10-point DNS sub-score penalty per domain that is wholly unreachable, and a new "Return Address Reachability" card. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>		2026-06-06 16:20:31 +09:00
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analyzer	dns: add ReturnOK check for sender domain reachability	2026-06-06 16:20:31 +09:00