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MDaemon alternatives · Email

Open-source alternatives to MDaemon

MDaemon is not described as open source on its own site. 39 of the 125 other email apps in this directory are open source, according to their own sites.

MDaemon's current pricing could not be confirmed from its own site. 33 of them are free or have a free plan.

39 tools · Listings checked up to Nov 13, 2026 · Where the facts come from

The 12 closest to MDaemon

  1. hMailServer

    Free open-source mail server that runs on Windows

    • hMailServer has a free plan. MDaemon does not, though it has a free trial.
    • Only MDaemon lists a web app.
    • Only MDaemon lists a macOS app.
    • hMailServer is open source, according to its own site.
    hMailServer vs MDaemonhMailServer pricing and details

  2. Zimbra

    Self-hosted email, calendar and file sharing for organizations

    • Only Zimbra lists Linux, iOS and Android apps.
    • Zimbra is open source, according to its own site.
    • Zimbra also covers tasks.
    Zimbra pricing and details

  3. SOGo

    Open-source groupware with webmail, calendars and contacts

    • SOGo has a free plan. MDaemon does not, though it has a free trial.
    • Only MDaemon lists Windows and macOS apps.
    • SOGo is open source, according to its own site.
    SOGo pricing and details

  4. Open-Xchange

    OX App Suite email platform sold to providers and governments

    • Only MDaemon lists Windows and macOS apps.
    • Open-Xchange is open source, according to its own site.
    Open-Xchange pricing and details

  5. Horde

    Free open-source webmail, calendar, contacts and tasks suite

    • Horde has a free plan. MDaemon does not, though it has a free trial.
    • Only MDaemon lists Windows and macOS apps.
    • Horde is open source, according to its own site.
    • Horde also covers notes and tasks.
    Horde pricing and details

  6. mailcow

    Dockerized open-source mail server with a web admin UI

    • mailcow has a free plan. MDaemon does not, though it has a free trial.
    • Only MDaemon lists Windows and macOS apps.
    • mailcow is open source, according to its own site.
    mailcow pricing and details

  7. Mail-in-a-Box

    Free script that turns a cloud server into your own mail server

    • Mail-in-a-Box has a free plan. MDaemon does not, though it has a free trial.
    • Only MDaemon lists Windows and macOS apps.
    • Mail-in-a-Box is open source, according to its own site.
    Mail-in-a-Box pricing and details

  8. Stalwart Mail Server

    Open-source mail and collaboration server written in Rust

    • Stalwart Mail Server has a free plan. MDaemon does not, though it has a free trial.
    • Only MDaemon lists Windows and macOS apps.
    • Stalwart Mail Server is open source, according to its own site.
    • Stalwart Mail Server also covers file sharing and dMARC.
    Stalwart Mail Server pricing and details

  9. Afterlogic WebMail

    Webmail front end for an existing IMAP mail server

    • Afterlogic WebMail has a free plan. MDaemon does not, though it has a free trial.
    • Only MDaemon lists Windows and macOS apps.
    • Afterlogic WebMail is open source, according to its own site.
    Afterlogic WebMail pricing and details

  10. Modoboa

    Open-source mail server with a web admin panel and webmail

    • Modoboa has a free plan. MDaemon does not, though it has a free trial.
    • Only MDaemon lists Windows and macOS apps.
    • Modoboa is open source, according to its own site.
    Modoboa pricing and details

  11. iRedMail

    Open-source mail server installer for Linux and BSD

    • iRedMail has a free plan. MDaemon does not, though it has a free trial.
    • Only iRedMail lists a Linux app.
    • Only MDaemon lists a web app.
    • Only MDaemon lists Windows and macOS apps.
    iRedMail pricing and details

  12. Proton Mail

    End-to-end encrypted email service based in Switzerland

    • Proton Mail has a free plan. MDaemon does not, though it has a free trial.
    • Only Proton Mail lists Linux, iOS and Android apps.
    • Proton Mail is open source and end-to-end encrypted, according to its own site.
    • MDaemon is self-hostable, according to its own site.
    Proton Mail pricing and details

27 more that are open source

All 39 in one table

Common questions

Is there an open-source alternative to MDaemon?

Yes. hMailServer, Zimbra, SOGo, Open-Xchange, Horde, mailcow, Mail-in-a-Box, Stalwart Mail Server and 31 more are open source, according to their own sites.

Is MDaemon open source?

MDaemon is not described as open source on its own site. The listing was checked on Nov 13, 2026 against the pages it cites.

Which of these email apps are free?

hMailServer, SOGo, Horde, mailcow, Mail-in-a-Box, Stalwart Mail Server, Afterlogic WebMail, Modoboa and 25 more are free or have a free plan.

When was this checked?

Each listing shows its own date. On this page they run from Oct 4, 2026 to Nov 13, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.

This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to MDaemon: the alternatives its listing names first, then the tools that share the most features with it.