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De-risk spike confirmed emersion/go-milter v0.4.1 (BSD-2) interoperates with Postfix 3.7.11 (bookworm) over protocol v6: reads From/To(per-rcpt)/Subject/ queue-id, gets client IP from Connect(), and fails open when the milter dies. Progress tracker updated; Phase 1 (Docker + supervisord) is next. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>