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Verdict READY. Real Vaultwarden test email travelled app → on-box go-smtp shim → relay-leg → Resend → real inbox, From felhom.eu, TLS/DKIM-aligned, Resend key never on the demo guest. Q4 central finding: raw-MIME passthrough via Resend SMTP delivers faithfully; parse-then-API silently drops inline (CID) images — hub leg should be SMTP passthrough, not the structured-API path. Probe code throwaway (not committed); cleaned up from guest 9201 + host 180. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NB4fVgvEurdKgyG8KoQSzC