KumoMTA on AWS production setup: 4 vCPU / 16 GiB baseline per official docs, $200-$610/mo dev footprint, SMTP architecture without ALB, and a 100+ item readiness checklist for self-hosted email infrastructure.
Postal v3 on AWS: 2 vCPU / 4 GiB minimum per official docs, RDS MariaDB production path, $250-$700/mo dev footprint, Docker + Caddy architecture, and 100+ item readiness checklist.
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