Prometheus and OTLP, /livez and /readyz, JSON logs into Elasticsearch, Loki or Splunk, and reading hMailServer's own logs when you are chasing a delivery.
hMailServer 6.3.3 — signed 15 September 2026, Windows and Linux, database schema 6040, and a drop-in upgrade from any 5.x install.Download 6.3.3 Documentation