iMail alternatives

  • Kolab Community

  • Kolab is entirely Free and Open Source Software (a.k.a. FOSS), and uses Open Standards. We’ll get to why this is important to us, and hope that it is important to you thereafter.

    tags: activesync caldav carddav groupware imap
  • Zentyal

  • Zentyal is a native Microsoft Active Directory® implementation on Linux incorporating all the network services required in a small and medium business environment: Directory & Domain Server, Mail Server, Gateway and Infrastructure Server.

    tags: linux-operating-systems groupware mail-server email-hosting web-interface
  • Kolab Now

  • Kolab Now, formerly MyKolab, is a fully featured secure collaboration and communication service that is easy to use on any device.

    tags: address-book caldav calendar carddav cloud-computing
  • SOGo

  • SOGo is groupware server with a focus on scalability and open standards.

    tags: caldav calendaring carddav groupdav groupware
  • Zimbra Collaboration Suite

  • Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra boosts the productivity of users on any desktop and dramatically reduces TCO compared to legacy platform vendors.

    tags: calendar groupware mail-server
  • iRedMail

  • A fully fledged, free email server solution, an open source project (GPL v2).

    tags: mail-server dkim spf
  • mailcow: dockerized

  • mailcow is a mail server suite based on Dovecot, Postfix and other open source software, that provides a modern Web UI for administration.

    tags: docker email-hosting email-management groupware mail-server
  • OX Open-Xchange

  • Open-Xchange Server 6 is the most advanced Linux based Groupware solution f.Open-Xchange Server 6 is superior in the following areas:• Open-Xchange Server 6 offers most comprehensive Groupwarefunctionality based on modern user interface technologies and includesemail, calendaring, contact management, intelligent document sharing,“smart linking” and much more.• The architecture is designed for deployment in the hosted market.• The architecture is designed for enterprises market

    tags: calendar german groupware groupware-imap-ldap-calendar mail-server
  • Microsoft Exchange Server

  • Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft. It is part of the Microsoft Servers line of server products and is widely used by enterprises using Microsoft infrastructure solutions. Exchanges major features consist of electronic mail, calendaring, contacts and tasks; support for mobile and web-based access to information; and support for data storage.

    tags: chat-servers mail-server
  • Kopano

  • Kopano puts an email, video meetings, calendaring, and file sharing solution within one single interface.

    tags: archiving caldav cloud-hosting email-client email-management
  • Zarafa

  • Open Source Collaboration, providing integration with your existing Linux mailserver, native mobile phone support, Outlook "Look & Feel" webaccess and stable Outlook sharing (100% MAPI).

    tags: calendar groupware mail-server
  • MDaemon Messaging Server

  • MDaemon Messaging Server software for Windows can be deployed in virtual, hosted cloud or private on-premise environments. It is used by businesses in over 90 countries and over 25 languages worldwide.

    tags: dropbox-integration email-encryption email-hosting encrypted-email group-chat
  • Kerio Connect

  • Kerio Connect makes email, calendars, contacts and task management easy and affordable. With Kerio Connect, you have immediate, secure access to your communications anytime, anywhere, on any device - without complexity or expensive overhead.

    tags: antivirus backup-and-restore chat-servers contact-sync imap-transfers