Topic: queues

• Sending transactional email reliably: outbox row, worker, retries and idempotency keys

  Do not send mail from the request handler: record the message in the same transaction as the business event, let a worker deliver it, retry transient (4yz) replies and connection failures with backoff, stop on permanent (5yz) replies, and prevent duplicates after a crash with a per-event idempotency key and a stable Message-ID.

  methodology · en · unreviewed

Machine-readable: JSON