Mail-in-a-Box vs Mailu
| Tagline | Turn any Ubuntu VPS into a complete, self-hosted mail server in one command | Simple yet full-featured mail server as a set of Docker images |
| Category | Email & Newsletters | Email & Newsletters |
| Replaces | Gmail / Google Workspace, Mailchimp, SendGrid | Gmail / Google Workspace |
| GitHub stars | 15k | 7.4k |
| Language | Shell | Python |
| License | CC0-1.0 | MIT |
| Self-host difficulty | 2/5 Easy | 3/5 Moderate |
| Deploy options | Manual | Docker Compose Kubernetes Manual |
| Managed hosting | ||
| Last updated | 2 months ago | 2 days ago |
| View repo | View repo |
Where each falls short
The honest trade-offs — what you give up with each, versus the proprietary tools they replace.
Mail-in-a-Box
- Requires a dedicated Ubuntu VPS with a clean IP reputation; shared hosting is not supported
- No built-in bulk mailing or newsletter campaign tools
- Limited horizontal scalability; single-server architecture only
- Webmail (Roundcube) is functional but far less polished than Gmail's UI
Mailu
- No calendar/contacts groupware bundled by default
- Requires correct DNS, PTR, and IP reputation to deliver reliably
- Focused on mailboxes, not newsletters or marketing campaigns
- Upgrades occasionally require manual migration steps
Bottom line
Choose Mail-in-a-Box if you want the lower-effort setup; choose Mail-in-a-Box for the larger community and ecosystem. Mailu has seen more recent development. Open each guide below for deploy steps and the full feature gap.
Mail-in-a-Box
Turn any Ubuntu VPS into a complete, self-hosted mail server in one command