Auditable Delivery Design for International SMS Alerts and B2B Report Emails

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The article argues that Plivo and Sinch should be treated as transport options within a larger auditable workflow rather than as the complete solution for report delivery. It recommends storing a report's digest, recipient policy context, attachment metadata, and transport responses as separate, immutable records, since a timeout or API acceptance does not prove the recipient received the report. The author distinguishes between sending failures, which are operational, and wrong reports, which are security incidents. For customer-facing monthly reports, the piece favors a queue-backed worker, using an idempotency key built from tenant, report, revision, and recipient to prevent duplicates on replay. It also explains that unknown outcomes after timeouts must be recorded carefully rather than retried blindly.

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