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Per Codex: outgoing reply now sets Reply-To = GOODNEWS_REPLY_TO_EMAIL, falling back to the From address. Never the reader's own address (they're the recipient). send_email gained an optional reply_to param. Failed-send stays UI-only (draft kept) — no schema change, per Codex's lean. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>