Mail-in-a-Box vs MailDev
| Tagline | Turn any Ubuntu VPS into a complete, self-hosted mail server in one command | Local SMTP server with a web UI to test app-generated email |
| Category | Email & Newsletters | Email & Newsletters |
| Replaces | Gmail / Google Workspace, Mailchimp, SendGrid | SendGrid |
| GitHub stars | 15k | 6k |
| Language | Shell | JavaScript |
| License | CC0-1.0 | MIT |
| Self-host difficulty | 2/5 Easy | 2/5 Easy |
| Deploy options | Manual | Docker Manual |
| Managed hosting | ||
| Last updated | 2 months ago | 21 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
MailDev
- A development/testing catcher only — not for sending real production email
- No deliverability, analytics, or campaign features
- Not intended as a long-running production mail service
- Limited storage/persistence for captured messages
Bottom line
Both are a similar lift to self-host; choose Mail-in-a-Box for the larger community and ecosystem. MailDev 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