all_recipients_failed

A personalized send accepted no recipients on any route allowed by delivery policy.

EmailAllRecipientsFailedError has code all_recipients_failed and exposes ordered adapter failures.

sendPersonalized resolves partial success. This error appears only when accepted would be empty.

Fallback is considered only when every recipient failure for the current route is not_sent, unless the caller explicitly enabled continuation after unknown delivery.

Check recipient validation, native provider rejection details available through server-side causes, and adapter capability before retrying.