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CHANGELOG/12 AUGUST 2025

KumoMTA Engine & High-Performance SMTP Gateway

Infrastructure
Backend

Integrated KumoMTA as our core mail transfer agent for high-throughput SMTP processing on ports 587 and 465.

PLANNING

  • MTA evaluation. Evaluated MTA architectures and adopted KumoMTA for its Lua-scriptable routing and high-throughput Rust engine.

BACKEND

  • KumoMTA integration. Integrated KumoMTA as the core Mail Transfer Agent in apps/backend/kumomta and apps/backend/smtp.
  • Gateway ports. Configured standard listeners on ports 587 (STARTTLS) and 465 (SMTPS) with TLS 1.3 encryption.

DEVOPS

  • Docker config. Built containerized KumoMTA service with environment-configured relay hosts and Mailpit local routing.
Reloop