Mox - modern, secure, all-in-one email server

Stay in control of your email and keep email decentralized!

Complete email solution: For sending and receiving email. With support for IMAP4, SMTP, SPF, DKIM, DMARC, MTA-STS, DANE and DNSSEC, reputation-based and content-based junk filtering, Internationalization (IDNA), automatic TLS with ACME and Let's Encrypt, account autoconfiguration, webmail.
Quick & easy: Use the quickstart command to set up mox for your domain(s) within 10 minutes. You'll get a secure mail server with a modern protocol stack. Upgrades are mostly a matter of downloading the new version and restarting. Maintenance via web interface (easy) or config file (powerful). No dependencies.
High quality and secure: Mox has a modern Go code base with plenty of automated tests, automated integration tests, is manually tested against popular mail server and client software, and is fuzz-tested. The code is well-documented and cross-referenced with the relevant standards (RFC's).
Open Source: Mox is an open source project, source code is MIT-licensed.

See Features for the details, including roadmap.

Latest release

The latest release is v0.0.13, released on 2024-11-06, see release notes, download binaries, or see all releases.

News

2024-11-06, v0.0.13 released
2024-10-06, v0.0.12 released
2024-04-30, v0.0.11 released
2024-03-09, v0.0.10 released
2024-01-09, v0.0.9 released
2023-12-08, There will be a talk about mox in the "Modern Email" devroom at FOSDEM 2024 (Feb 3 & 4, Brussels). See you there!
2023-11-22, v0.0.8 released
2023-09-24, v0.0.7 released

Quickstart demo

Mox is real easy to set up. Get a machine, download the mox binary, run the quickstart, add the printed DNS records, and you've got a working modern mail server. See the demo below, or continue reading at Install.

Not ready for a full setup yet? Try mox in less than a minute: download and run "mox localserve". It serves a local-only SMTP/IMAP/Webmail/etc for testing and development. No setup required.

Background

Work on mox started in 2021. Admins were migrating their emails to just a few cloud/hosting providers. In part because running and maintaining email software had become more complicated over time: additional email protocols required yet another component in the software stack. Combining all these components into a working email server had become too troublesome over time. These components were also often written in C, a programming language where a small mistake typically has large consequences.

Mox is a modern email server that implements all modern email protocols in a single easy to use and maintain application.

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