| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 4 | 1 |
| Spec score · Mail Server Software | 8.4 (#2) | 7.9 (#18) |
| Administration | Administrators can manage the server through WebAdmin and automate operations with the command-line interface and CLI API. | Admin features include global administrators, announcements, per-domain delegation, and quotas. |
| Deployment | The product is downloadable for Linux and Windows and offers Docker images and Kubernetes deployment with AxiHelm. | Mailu runs as Docker containers and documents Docker Compose and Kubernetes deployment options. |
| Founded | 2004 | 2014 |
| Integrations | The features page lists OpenLDAP, Active Directory, OAuth 2.0, OpenID Connect, Zoom, and Microsoft Teams integrations or support. | The documentation describes Nextcloud authentication through IMAP and calendar and address-book access through Radicale using WebDAV/CardDAV/CalDAV clients. |
| Product | Axigen is an all-in-one email, calendaring, and collaboration platform for organizations from small businesses to large service providers. | Mailu is a free software mail server distributed as a set of Docker images. |
| Security | Listed protections include authentication and encryption, access and flow controls, SPF, DKIM, DMARC compliance, and two-step verification. | Listed security features include enforced TLS, DANE, MTA-STS, Let's Encrypt, outgoing DKIM, antivirus scanning, and blocking malicious attachments. |
| Support | The support page says business and channel support engineers are available around the clock, with an average response time under two hours for all issue types. | 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. |
