moxmodern full-featured open source secure mail server for low-maintenance self-hosted email

mox

Mox is a modern, full-featured open source mail server designed for low-maintenance self-hosted email. It provides everything needed to run your own email service for custom domains with automatic security, spam filtering, and easy setup through a quickstart wizard.

Key Features

• SMTP and IMAP support: Complete email protocol implementation with extensions for receiving, submitting, and delivering messages, plus webmail access
• Security and authentication: SPF, DKIM, DMARC, DANE, MTA-STS, automatic TLS with ACME and Let's Encrypt integration
• Spam filtering: Bayesian learning-based filtering, reputation tracking, and smart rate-limiting for untrusted senders
• Admin interface: Web-based dashboard for domain, account, and alias management with DNS record generation and configuration guidance
• Developer-friendly: HTTP/JSON API for transactional email, webhooks for delivery events, Prometheus metrics, and structured logging

Use Cases

• Domain email hosting: Run your own email service for custom domains without relying on third-party providers
• Privacy-focused communication: Maintain complete control over email data with self-hosted infrastructure
• Transactional email: Send signup confirmations, password resets, and other automated messages via simple API integration
• Testing and development: Use localserve mode for email-related testing and development with pedantic RFC compliance checking

Who Is It For

Mox is ideal for developers, system administrators, and privacy-conscious organizations seeking to self-host email infrastructure. It's designed for those who want a straightforward, secure mail server without extensive maintenance overhead.