iRedMail is described as 'A fully fledged, free email server solution, an open source project (GPL v2)' and is an app in the Online Services category. There are more than 50 alternatives to iRedMail for a variety of platforms, including the Web, Windows, Linux, Mac and Self-Hosted solutions. The best alternative is mailcow: dockerized, which is both free and Open Source. Other great apps like iRedMail are Mail-in-a-box (Free, Open Source), mail.com (Free), Zimbra Collaboration Suite (Freemium, Open Source) and hMail Server (Free, Open Source).
- Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. View 42 alternatives to Zimbra Collaboration Suite
- Freemium • Open Source