Short answer: for an urgent US/EU compliance notice, send SMS first, poll its delivery state, and send email only after a terminal nondelivery result or a bounded deadline; keep the policy, audit log, country allowlist, and retries in your own service. The deciding constraint is integration effo...
Source: [Dev.to](https://dev.to/zanesterling7589/a-guide-to-urgent-compliance-notifications-with-delivery-polling-and-fallback-logic-llo)