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- internal/mail: MailBackend interface (Send/Start/Capabilities) + NullBackend. - internal/core: inbox/message/thread services over pgx; default-pod bootstrap. - IngestRaw: real mox/message parse → body extraction (text/html walk) → quote-stripping (extracted_text) → reference-based threading → store, all in one tx; emits message.received event; populates FTS tsvector. - core implements mail.InboundSink (Deliver) so any backend feeds the same path. - internal/api: v0 routes wired live (was 501) — create/list/get inbox, ingest, list/get messages, list/get thread(+messages), send/reply (503 via NullBackend). - cmd/openmail serve: builds core + NullBackend, ensures default pod. Verified e2e vs Postgres 16: inbox create; ingest original+reply → same thread via In-Reply-To/References; extracted_text strips quoted history; thread detail ordered; FTS matches 'invoice'; events written; send → honest 503. vet clean. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>