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How to Evaluate a Transactional Email API Before It Causes an Incident

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Choosing a transactional email API requires more than comparing send prices — teams must verify that the service supports custom domain verification, DKIM key rotation with overlapping selectors, and exportable suppression lists with reasons and timestamps. A critical distinction is that API request acceptance and actual message delivery are separate states, and conflating them makes retry logic dangerous, leading to dropped or duplicate messages. Suppression records should differentiate between user unsubscribes, permanent delivery failures, and operator blocks rather than collapsing all three into a single boolean flag. DMARC reporting should be treated as an ongoing operational signal, with a named owner in the team's runbook who monitors aggregate reports and acts on anomalies. Engineers are advised to test each of these capabilities explicitly — including webhook replay, event retention, and rollback procedures — before committing to a provider.

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