Maddy Mail Server vs Mail-in-a-Box
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
| Feature | Maddy Mail Server | Mail-in-a-Box |
|---|---|---|
| Deploy effort | Under-an-hour setup | ≈5-minute setup |
| Health score | 89 · Excellent | 94 · Excellent |
| Category | Mail Servers | Mail Servers |
| License | GPL-3.0 | CC0-1.0 |
| Language | Go | Python |
| Setup difficulty | Medium | Easy |
| Min. RAM | 256 MB | 1,024 MB |
| Deployment | docker, binary, source | bare-metal, one-click |
| GitHub stars | ★ 6,091 | ★ 15,418 |
| First released | 2019 | 2014 |
| Replaces | Google Workspace, Microsoft 365 | Google Workspace, Microsoft 365 |
What are Maddy Mail Server and Mail-in-a-Box?
Maddy Mail Server
Maddy is a single-process mail server written in Go that replaces Postfix, Dovecot, and several other components. It is designed to be simple to configure while remaining flexible.
- Single binary replaces full stack
- SMTP, IMAP and submission in one
- Simple unified configuration
- Built-in DKIM and TLS management
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
Maddy Mail Server vs Mail-in-a-Box: key differences
Maddy Mail Server is written in Go, while Mail-in-a-Box is built with Python. Licensing differs — GPL-3.0 for Maddy Mail Server versus CC0-1.0 for Mail-in-a-Box. Maddy Mail Server 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 Maddy Mail Server arrived in 2019. Mail-in-a-Box has the considerably larger community, at 15,418 GitHub stars versus 6,091. Maddy Mail Server lists first-class Docker deployment; Mail-in-a-Box does not.
Why pick each one
Choose Maddy Mail Server if…
- Drastically simpler than traditional stacks
- Low resource use
Watch out for
- Fewer features than mature stacks
- Smaller community
Choose Mail-in-a-Box if…
- Very beginner-friendly
- Opinionated, complete stack
Watch out for
- Limited customization
- Dedicated server required
Frequently asked questions
Is Maddy Mail Server or Mail-in-a-Box better?
Mail-in-a-Box is the stronger all-round pick: it has both the larger community and the simpler easy setup. Consider Maddy Mail Server if its specific feature set fits your needs better.
Are Maddy Mail Server and Mail-in-a-Box free and open-source?
Yes. Maddy Mail Server is licensed under GPL-3.0 and Mail-in-a-Box under CC0-1.0. Both can be self-hosted at no software cost.
Can I run Maddy Mail Server and Mail-in-a-Box with Docker?
Maddy Mail Server: yes. Mail-in-a-Box: check the project docs for container support.
Which is lighter on resources, Maddy Mail Server or Mail-in-a-Box?
Maddy Mail Server 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.