Mox

Mox is a modern, security-focused, all-in-one email server designed to make running email for your own domain straightforward and low-maintenance. It bundles core mail protocols and deliverability tooling into a single application, with an admin UI and strong operational visibility.

Key Features

• SMTP server for receiving, submission, and delivery, with modern extensions
• IMAP4 server (with extensions) for email client access
• Built-in webmail for reading and sending email in the browser
• Deliverability features including SPF, DKIM, and DMARC (including aggregate reports)
• Modern transport security support such as ACME-managed TLS, MTA-STS and DANE, plus TLS reporting
• Reputation and content-based junk filtering, including per-user Bayesian spam learning and throttling of low-reputation senders
• Admin web interface for managing domains, accounts, aliases/lists, and configuration guidance (including DNS record instructions)
• Account autodiscovery support for easier client configuration
• Optional built-in web server and reverse proxy capabilities
• HTTP/JSON API and webhooks for transactional email and inbound/delivery events, plus Prometheus metrics and structured logging

Use Cases

• Hosting email for personal or small-organization domains with a single integrated stack
• Running a transactional mail endpoint with API-driven sending and delivery event callbacks
• Email testing and development using the local-only test mode

Limitations and Considerations

• POP3 is not supported
• Some advanced features (for example JMAP, Sieve, OAuth2 login, and full mailing list management) are listed as roadmap items rather than fully implemented

Mox is a good fit when you want a cohesive mail server that minimizes external dependencies while still supporting a modern email security and deliverability stack. Its integrated approach, admin UI, and operational tooling aim to reduce the ongoing effort typically associated with running mail infrastructure.