Delivery logs

Every send attempt produces a delivery log entry, so you can see exactly what happened to each email — and replay or debug failures.

Statuses

• sent — accepted by the sender's mailbox.
• failed — a downstream send failure; see the error field.
• suppressed — the recipient was unsubscribed; the send was skipped (a successful no-op).
• sending — in flight.

What each log records

• Recipient — the to address.
• Template — which template was rendered.
• Webhook — the endpoint the trigger came through.
• Error — the failure reason, when status is failed.
• Merged variables — the exact variables object used for the send.

Idempotency

Pass an idempotency_key in the trigger body to dedupe retries. A repeated request with the same key resolves to the original delivery instead of sending again — safe to retry on network errors.