Bulk email without burning reputation
· 7 min read
Large-scale reminder campaigns needed to reach a large eligible audience without a single-day blast that would spike SES throttling, bounces, and complaints. Reputation here was mostly an operations problem: control how much mail leaves per day and how fast it hits SES, then watch Virtual Deliverability Manager (VDM) while sending.
The code does not score reputation. It paces volume, targets an average send rate within each batch, deduplicates by send date, and filters eligibility in SQL. Below: the two guardrails, how createBatches and runBatch enforce them, and the path through Kafka and the messenger Lambda to the messaging API and SES.