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Dependencies

  • Email providers: Resend, SendPulse, Brevo, Mailjet, Mailtrap, plus SMTP.
  • Resilience4j circuit breaker per provider.
  • Redis stream listener.
  • Spring Mail on the local profile.

Timeouts and circuit breakers belong on the client adapter, not in the use case. A failed downstream call for a non-critical side effect should become an outbox or inbox retry, not a user-facing 500, when the business write has already committed.