| Price from | €8.90/mo | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Linux | Yes | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| API | — | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 7 | 1 |
| Spec score · Mail Server Software | 8.4 (#3) | 7.9 (#18) |
| Administration | The mailcow web interface lets administrators create domains and email addresses and manage most settings. | Admin features include global administrators, announcements, per-domain delegation, and quotas. |
| Integrations | The documentation lists client setup guides for Android, Apple macOS/iOS, eM Client, KDE Kontact, Outlook, and Thunderbird. | The documentation describes Nextcloud authentication through IMAP and calendar and address-book access through Radicale using WebDAV/CardDAV/CalDAV clients. |
| Product | mailcow: dockerized is an open-source groupware and email suite based on Docker. | Mailu is a free software mail server distributed as a set of Docker images. |
| Requirements | The documented minimum is 1 GHz CPU, 6 GiB RAM plus 1 GiB swap, and 20 GiB disk excluding email storage; x86_64 and ARM64 are listed architectures. | The documentation lists minimum memory and swap of 1 GB each without ClamAV, or 3 GB memory and 1 GB swap with ClamAV. |
| Security | Two-factor authentication options include YubiKey OTP, WebAuthn, and TOTP. | Listed security features include enforced TLS, DANE, MTA-STS, Let's Encrypt, outgoing DKIM, antivirus scanning, and blocking malicious attachments. |
| Support | Commercial support is available through Servercow, while community support is voluntary, best-effort, and not guaranteed. | 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. |
