| Price from | $1.35/mo | — |
| Free plan | — | — |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | — |
| Windows | Yes | — |
| macOS | Yes | Yes |
| Linux | — | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| API | Yes | — |
| Self-hosted | Yes | Yes |
| Plans published | 3 | 0 |
| Spec score · Mail Server Software | 8.3 (#5) | 7.2 (#30) |
| Integrations | The product page describes Outlook Sync for syncing email, calendar, tasks, and notes with Outlook; the cloud API provides access to calendars, files, notes, contacts, tasks, and emails. | The add-on directory lists third-party tools for authentication, content filtering, policy services, webmail, and other functions; entries are maintained by their authors without formal evaluation. |
| Product | IceWarp is an all-in-one collaboration platform combining email, messaging, video conferencing, file sharing, and real-time document collaboration in one interface. | Postfix is Wietse Venema’s mail server, created as an alternative to Sendmail. |
| Support | The pricing page lists 24/7 support for cloud customers and offers Cloud Plus support with a 24/7 hotline and stated response targets. | The postfix-users mailing list is for questions, problem reports, and feature requests; non-member postings are silently discarded. |
