| Price from | $0.83/mo | Free |
| Free plan | — | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| Linux | Yes | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 2 | 1 |
| Spec score · Mail Server Software | 8.3 (#6) | 7.9 (#18) |
| Administration | Its web interface supports domain-level administrators, user self-service, message throttling, and account search. | Admin features include global administrators, announcements, per-domain delegation, and quotas. |
| Deployment | The Enterprise Edition is an on-premises product that keeps data on the user's own server. | Mailu runs as Docker containers and documents Docker Compose and Kubernetes deployment options. |
| Founded | 2007 | 2014 |
| Purpose | iRedMail is open-source software for deploying a full-featured mail server. | The project aims to provide an easily set up and maintained full-featured mail server without proprietary software or unrelated groupware features. |
| Support | Enterprise Edition pricing includes technical support; general technical questions and issues can also be posted to the online forum. | The project directs simple questions to its Matrix room, complex questions to GitHub discussions, and bug reports to GitHub issues; it describes itself as mostly developed in contributors' free time. |