iRedMail is described as 'A fully fledged, free email server solution, an open source project (GPL v2)' and is a Mail Server in the online services category. There are more than 50 alternatives to iRedMail for a variety of platforms, including Web-based, Windows, Linux, Self-Hosted and Mac apps. The best iRedMail alternative is mailcow: dockerized, which is both free and Open Source. Other great apps like iRedMail are Mail-in-a-box, MyInfo, Zimbra Collaboration Suite and AOL Mail.
KOI (Kommunikation, Organisation, Information) is a cloud based task, document and process management software. KOI stores all your ideas, projects, tasks and documents in the cloud. The KOI Desktop App based on the Eclipse RCP uses most of the features of the platform including...
OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and Exchange protocols.
KNode is a KDE-application to access Usenet newsgroups and mailing lists. KNode is your usenet mail reader.
An enterprise application server that integrates information into a single workspace, integrates also a full mail server
Real-time email, chat, audio/video calls & conferences, file-sharing, and contacts app with a modern and intuitive UI.
Low cost, easy to use Email Server software for virtual, on-premise, or hosted deployments for companies that want control of their email. Integrated web-mail with doc sharing, Drop Box integration, client and server side encryption.
Mailu is a simple yet full-featured mail server as a set of Docker images. It is free software (both as in free beer and as in free speech), open to suggestions and external contributions.
Mulberry is a powerful, easy to use electronic mail (email) and calendar program that allows you to send, access, and manage email and calendars. Mulberry also helps you manage other related information, such as contact information.
Full featured solution for your Email server. Native implementation of last anti-SPAM metods, webmail and easy administration included.
mu is a tool for dealing with e-mail messages stored in the Maildir-format, on Unix-like systems. mu's main purpose is to help you to find the messages you need, quickly; in addition, it allows you to view messages, extract attachments, create new maildirs, …
OBM is a free messaging and collaboration platform useful for just a couple to many thousands of users with strong support for mobile devices.
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It's a Desktop App, not a mail server. Not even close to the same.