- [Axigen](https://www.axigen.com/mail-server/free/) `⊘ Proprietary` - Great alternative to open source. It's a turnkey messaging solution, perfect for small & micro businesses, integration projects or test environments.
- [Cloudron](https://cloudron.io) `⊘ Proprietary` - Open-core software allowing you to effortlessly self-host web apps on your server. ([Source Code](https://git.cloudron.io/groups/cloudron)) `Nodejs/Docker`
- [hMailServer](https://www.hmailserver.com) `⊘ Proprietary` - Open source e-mail server for Microsoft Windows. ([Source Code](https://github.com/hmailserver/hmailserver)) `C++`
- [Poste.io](https://poste.io) `⊘ Proprietary` - Full featured solution for your Email server. Native implementation of last anti-SPAM metods, webmail and easy administration included. Free tier available. ([Demo](https://poste.io/admin/login#admin@poste.io;admin))
- [Poste.io](https://poste.io) `⊘ Proprietary` - Full featured solution for your Email server. Native implementation of last anti-SPAM methods, webmail and easy administration included. Free tier available. ([Demo](https://poste.io/admin/login#admin@poste.io;admin))