) Don't deliver to addresses that hard-bounced or complained. Suppressed recipients block POST /send (422) unless the API key is exempt. - schema: suppressions table (address unique, reason, source, note) + api_keys.suppression_exempt (per-key send policy) + migration 0018 - domain/suppressions: repository (upsert-by-address, findSuppressed) + service (add/remove/filterSuppressed/addFromBounce, address normalizing) - send pipeline: POST /send rejects suppressed recipients with 422 (listing them) unless req.apiKey.suppressionExempt - auto-suppress: BounceService adds hard-bounce recipients to the list (wires #21 → #24); soft bounces are not suppressed - api keys: suppressionExempt at creation + PATCH /admin/api/api-keys/:id toggle; exposed in ApiKeyDTO + UI (column + toggle) - routes: /admin/api/suppressions (list/add/delete), admin-scoped - UI: Suppressions page (en/ru i18n) + nav; MCP: list/add/remove_suppression - tests: suppression integration (CRUD, send blocking incl. multi-recipient, exempt bypass, auto-suppress from hard bounce, per-key PATCH) Closes #24 Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Bounce / delivery feedback (DSN capture) #21

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