How to Build Reliable Compliance Notifications with SMS Polling and Email Fallback

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For urgent US/EU compliance notices in B2B SaaS, SMS should serve as the primary delivery channel, with email triggered only after a confirmed non-delivery or a set deadline is reached. The recommended approach uses an application-owned state machine with four durable states to track every delivery transition, ensuring a clear audit trail independent of provider dashboards. A single stable application ID must link both channels, and email fallback must use a deterministic idempotency key to prevent duplicate sends during worker failures. Country allowlists, retry limits with exponential backoff, and per-notice deadline records should all be managed within the application layer rather than delegated to provider consoles. The architecture prioritizes explainability and compliance auditability over minimizing API calls or relying on vendor-supplied delivery guarantees.

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