Dev Team Ditches AWS SES After Hidden Visibility Gaps Trigger Customer Alert Failure

A development team discovered a critical gap in AWS SES after a Friday incident where 200 of 14,000 emails silently bounced, leaving an enterprise client without system alerts. The root cause was an SPF record misconfiguration following a domain migration, but SES provided no proactive alerts or easy way to investigate individual delivery failures. The team found that while SES costs roughly $1 per 10,000 emails — potentially saving hundreds monthly over rivals like SendGrid — it lacks built-in delivery logs, searchable bounce reasons, and actionable event data without custom AWS infrastructure. This experience led them to build Reloop, an open-source, self-hostable email infrastructure tool designed to combine SES-level cost efficiency with the delivery visibility of managed providers. The episode highlights a broader trade-off: low-cost email sending engines require significant engineering investment to match the operational transparency that managed platforms offer out of the box.