Transactional Latency: Measuring Time-to-Inbox
For OTPs and password resets, seconds are the metric. Where latency hides in the sending path, how to measure time-to-inbox honestly, and what budgets to hold.
#Reliability
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Duplicate Sends: Idempotency in Email Pipelines
Everyone has received the same email twice. The retry loops, queue semantics, and race conditions that cause duplicates, and the idempotency patterns that stop them.