Elemta

Elemta is a high-performance SMTP server written in Go with a modular pipeline, queue management, API/web surfaces, and production-focused security controls.

Highlights

• SMTP server with extensible processing pipeline
• Queue backends: file (default) and sqlite (opt-in)
• Built-in queue/API/web tooling for operational visibility
• Delivery/auth integrations (file, LDAP, SQL backends)
• Docker and Kubernetes deployment assets
• Prometheus/Grafana-ready metrics and health endpoints

Quick Start

1) Local development (recommended)

git clone https://github.com/busybox42/elemta.git
cd elemta

# Minimal stack (fast)
make install-dev

# Full stack (clamav/rspamd/roundcube included)
# make install-dev-full

Useful commands:

make status
make logs-elemta
make test
make test-load

2) Run from source

make build
./bin/elemta server --config ./config/elemta.toml

3) Docker Compose directly

docker compose -f deployments/compose/docker-compose.yml up -d

Core Docs

• Documentation index
• Installation
• Configuration
• Queue backend operator runbook
• Queue management
• Testing
• Production deployment
• API reference

Security & Project Governance

• Security policy
• Contributing guide
• Code of conduct
• Support

Contributing

PRs are welcome. Before opening one:

1. Run tests and lint locally (make test and make lint)
2. Update docs when behavior/config changes
3. Keep changes focused and scoped

Full guide: CONTRIBUTING.md

License

MIT. See LICENSE.