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Microsoft Exchange Server Alternatives for Linux

Microsoft Exchange Server is not available for Linux but there are plenty of alternatives that runs on Linux with similar functionality. The best Linux alternative is Kopano, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Microsoft Exchange Server and many of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Microsoft Exchange Server are Google Workspace, mailcow: dockerized, Zentyal and Kolab Community.

Microsoft Exchange Server alternatives are mainly Mail Servers but may also be WebMail Providers or Calendar Apps. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Microsoft Exchange Server.
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  • Windows
  • Online

Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft. It is part of the...

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  1. Blue Mind is a complete solution of company messaging, calendars and collaborative work. It aims to enable you to work daily with comprehensive, useful, efficient and effective tools.

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    Webmail
  2. grommunio icon

    grommunio

    • FreemiumOpen Source
    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Self-Hosted

    grommunio (formerly known as grammm) efficiently combines all requirements of modern, digital communication and collaboration.

    ⚫︎ Real time collaborationMultiple users can work together in grommunio simultaneously.
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    grommunio vs Microsoft Exchange Server opinions
    pros, cons and recent comments
    norbertlambing

    As the first open source solution to offer a full-featured OutlookAnywhere (RPC over HTTP) and MAPI/HTTP implementation, grammm is the alternative to proprietary backends for native interoperability with Microsoft Outlook

    Positive comment ago
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  3. Axigen provides a multi-tenant, fully integrated, multi-platform, all-in-one email, calendaring and collaboration messaging solution.

    ⚫︎ CustomizableAxigen is easy to customize with themes or similar features.
    ⚫︎ Real time collaborationMultiple users can work together in Axigen simultaneously.
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    Axigen vs Microsoft Exchange Server opinions
    pros, cons and recent comments
    Menoetius

    Axigen is so much easier to use, it has the on-premise solution, and has unbeatable prices!

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  4. Citadel

    • FreeOpen Source
    • Linux
    • Online

    Is a collaboration suite (messaging and groupware). It is designed to run on open source operating systems such as Linux or BSD.

    ⚫︎ Real time collaborationMultiple users can work together in Citadel simultaneously.
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  5. Zarafa icon

    Zarafa

    • Mac
    • Windows
    • Linux
    • Online

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

    ⚫︎ Real time collaborationMultiple users can work together in Zarafa simultaneously.
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    Discontinued

    "Last year we released the announcement that Zarafa customers could transition to Kopano. We also announced that Zarafa would not be maintained beyond May 1st, 2017. Most ZCP customers have moved to a Kopano subscription now."

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  6. Sendmail icon

    Sendmail

    • FreeOpen Source
    • Mac
    • Linux

    Sendmail is a general purpose internetwork email routing facility that supports many kinds of transfer and delivery methods, including the Simple Mail Transfer Protocol (SMTP) used for email transport over the Internet.

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    Main Page
  7. EGroupware icon

    EGroupware

    • FreemiumOpen Source
    • Linux
    • Online
    • Self-Hosted
    • Software as a Service (SaaS)

    Online Collaboration with Chat and Online Office. Is developed as open source software in Germany, offered as free community version and as commercial version. Operation as self-hosted or as SaaS from the computer centre.

    ⚫︎ Real time collaborationMultiple users can work together in EGroupware simultaneously.
    ⚫︎ CustomizableEGroupware is easy to customize with themes or similar features.
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    EGroupware on the desktop
   ---   
EGroupware offers with the modules

- E-mail
- Calendar
- Address book
- InfoLog (tasks, notes, ...)
- File manager
- Ticket system
- Project Manager
- Timesheet

- Collabora Online Office
- Rocket.Chat

an entire office in the browser.
  8. Atmail Email Server icon

    Atmail Email Server

    • Linux
    • Online

    Atmail webmail system offers a webmail client, email server platform and mailserver appliance for Linux, Unix and Windows.

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    Intuitive Webmail Interface
  9. Poste.io icon

    Poste.io

    • Free PersonalProprietary
    • Linux

    Full featured solution for your Email server. Native implementation of last anti-SPAM metods, webmail and easy administration included.

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  10. atmail icon

    atmail

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Android Tablet
    • iPad

    Atmail provides services providers with email solutions.

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    Screenshot
Showing 20 of 26 alternatives