Mail-in-a-Box vs Mox
A side-by-side comparison of two self-hosted mail servers options — licensing, setup difficulty, resource needs, and what each one replaces.
Mail-in-a-Box
Turn a fresh server into a working mail server
VS
Mox
Modern, secure all-in-one mail server
| Feature | Mail-in-a-Box | Mox |
|---|---|---|
| Deploy effort | ≈5-minute setup | Under-an-hour setup |
| Health score | 94 · Excellent | 90 · Excellent |
| Category | Mail Servers | Mail Servers |
| License | CC0-1.0 | MIT |
| Language | Python | Go |
| Setup difficulty | Easy | Easy |
| Min. RAM | 1,024 MB | 256 MB |
| Deployment | bare-metal, one-click | docker, binary, source |
| GitHub stars | ★ 15,418 | ★ 5,868 |
| First released | 2014 | 2023 |
| Replaces | Google Workspace, Microsoft 365 | Google Workspace, Microsoft 365 |
What are Mail-in-a-Box and Mox?
Mail-in-a-Box
Mail-in-a-Box is an easy-to-deploy bundle that turns a clean Ubuntu server into a complete mail and web server. It automates DNS, webmail, contacts, calendar, and antispam setup.
- One-command full mail setup
- Automatic DNS and TLS
- Roundcube webmail and Nextcloud contacts
- Built-in admin dashboard
Mox
Mox is a modern mail server written in Go that provides SMTP, IMAP, and automatic TLS in a single binary. It is designed for easy, secure self-hosting with sensible defaults.
- Single binary mail server
- Automatic TLS and DNS guidance
- Built-in spam filtering
- Quickstart wizard for setup
Mail-in-a-Box vs Mox: key differences
Mail-in-a-Box is written in Python, while Mox is built with Go. Licensing differs — CC0-1.0 for Mail-in-a-Box versus MIT for Mox. Mox is the lighter option, starting around 256 MB of RAM against 1,024 MB for Mail-in-a-Box. Mail-in-a-Box is the more established project (first released 2014), while Mox arrived in 2023. Mail-in-a-Box has the considerably larger community, at 15,418 GitHub stars versus 5,868. Mox lists first-class Docker deployment; Mail-in-a-Box does not.
Why pick each one
Choose Mail-in-a-Box if…
- Very beginner-friendly
- Opinionated, complete stack
Watch out for
- Limited customization
- Dedicated server required
Choose Mox if…
- Very easy to deploy
- Strong modern defaults
Watch out for
- Young project
- No webmail included
Frequently asked questions
Is Mail-in-a-Box or Mox better?
Neither is universally better. Mail-in-a-Box has the larger community; both share a easy setup difficulty, so the decision comes down to features and licensing.
Are Mail-in-a-Box and Mox free and open-source?
Yes. Mail-in-a-Box is licensed under CC0-1.0 and Mox under MIT. Both can be self-hosted at no software cost.
Can I run Mail-in-a-Box and Mox with Docker?
Mail-in-a-Box: check the project docs for container support. Mox: yes.
Which is lighter on resources, Mail-in-a-Box or Mox?
Mox has the smaller minimum footprint at 256 MB of RAM, compared to about 1,024 MB for Mail-in-a-Box. Real-world usage depends on library size, user count, and enabled features.