ReferenceError codes
adapter_error
One adapter or transport failed with explicit retryability and delivery certainty.
EmailAdapterError exposes:
adapter- optional HTTP
status - optional provider
requestId retryabledelivery: "not_sent" | "unknown"- standard
cause
not_sent means fallback may proceed. unknown means delivery cannot be ruled out and fallback stops by default.
if (error instanceof EmailAdapterError && error.delivery === "unknown") {
await reconcileProviderState(error.requestId);
}A retryable flag does not override abort or unknown-delivery policy. It only participates in the configured retry decision for the current adapter.