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GMX Mail alternatives · Email

Self-hosted alternatives to GMX Mail

The GMX Mail listing does not say it can be self-hosted. 25 of the 125 other email apps in this directory can be self-hosted, according to their own sites.

GMX Mail is free to use. 19 of them are free or have a free plan.

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

The 12 closest to GMX Mail

  1. Inbox Zero

    Open source AI email assistant for Gmail and Outlook

    • Inbox Zero starts at $18 per user / month, billed annually ($20 billed monthly). GMX Mail is free.
    • GMX Mail has a free plan. Inbox Zero does not, though it has a free trial.
    • Only Inbox Zero lists macOS and Windows apps.
    • Inbox Zero is open source and self-hostable, according to its own site.
    Inbox Zero pricing and details

  2. Zero Mail

    Open-source AI email client that connects your existing inboxes

    • Zero Mail starts at $20 per month (billing basis not shown). GMX Mail is free.
    • Only GMX Mail lists iOS and Android apps.
    • Only GMX Mail lists a browser extension.
    • Zero Mail is open source and self-hostable, according to its own site.
    Zero Mail pricing and details

  3. Zimbra

    Self-hosted email, calendar and file sharing for organizations

    • GMX Mail has a free plan. Zimbra does not.
    • Only Zimbra lists Windows, macOS and Linux apps.
    • Only GMX Mail lists a browser extension.
    • Zimbra is open source and self-hostable, according to its own site.
    Zimbra pricing and details

  4. SOGo

    Open-source groupware with webmail, calendars and contacts

    • SOGo is free. GMX Mail is free.
    • Only GMX Mail lists iOS and Android apps.
    • Only GMX Mail lists a browser extension.
    • SOGo is open source and self-hostable, according to its own site.
    SOGo pricing and details

  5. Open-Xchange

    OX App Suite email platform sold to providers and governments

    • GMX Mail has a free plan. Open-Xchange does not.
    • Only GMX Mail lists iOS and Android apps.
    • Only GMX Mail lists a browser extension.
    • Open-Xchange is open source and self-hostable, according to its own site.
    Open-Xchange pricing and details

  6. Horde

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

    • Horde is free. GMX Mail is free.
    • Only GMX Mail lists iOS and Android apps.
    • Only GMX Mail lists a browser extension.
    • Horde is open source and self-hostable, according to its own site.
    Horde pricing and details

  7. mailcow

    Dockerized open-source mail server with a web admin UI

    • mailcow is free. GMX Mail is free.
    • Only GMX Mail lists iOS and Android apps.
    • Only GMX Mail lists a browser extension.
    • mailcow is open source and self-hostable, according to its own site.
    mailcow pricing and details

  8. Mail-in-a-Box

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

    • Mail-in-a-Box is free. GMX Mail is free.
    • Only GMX Mail lists iOS and Android apps.
    • Only GMX Mail lists a browser extension.
    • Mail-in-a-Box is open source and self-hostable, according to its own site.
    Mail-in-a-Box pricing and details

  9. Stalwart Mail Server

    Open-source mail and collaboration server written in Rust

    • Stalwart Mail Server starts at $2.40 per mailbox / year, billed annually (25-mailbox minimum). GMX Mail is free.
    • Only GMX Mail lists iOS and Android apps.
    • Only GMX Mail lists a browser extension.
    • Stalwart Mail Server is open source and self-hostable, according to its own site.
    Stalwart Mail Server pricing and details

  10. Cypht

    Open-source webmail that combines many accounts in one inbox

    • Cypht is free. GMX Mail is free.
    • Only GMX Mail lists iOS and Android apps.
    • Only GMX Mail lists a browser extension.
    • Cypht is open source and self-hostable, according to its own site.
    Cypht pricing and details

  11. Afterlogic WebMail

    Webmail front end for an existing IMAP mail server

    • Afterlogic WebMail starts at $49 one-time for 5 users, first year of support included. GMX Mail is free.
    • Only GMX Mail lists iOS and Android apps.
    • Only GMX Mail lists a browser extension.
    • Afterlogic WebMail is open source and self-hostable, according to its own site.
    Afterlogic WebMail pricing and details

  12. Modoboa

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

    • Modoboa is free. GMX Mail is free.
    • Only GMX Mail lists iOS and Android apps.
    • Only GMX Mail lists a browser extension.
    • Modoboa is open source and self-hostable, according to its own site.
    Modoboa pricing and details

13 more that can be self-hosted

All 25 in one table

Common questions

Is there a self-hosted alternative to GMX Mail?

Yes. Inbox Zero, Zero Mail, Zimbra, SOGo, Open-Xchange, Horde, mailcow, Mail-in-a-Box and 17 more can be self-hosted, according to their own sites.

Can GMX Mail be self-hosted?

The GMX Mail listing does not say it can be self-hosted. The listing was checked on Nov 12, 2026 against the pages it cites.

Which of these email apps are free?

Zero Mail, SOGo, Horde, mailcow, Mail-in-a-Box, Stalwart Mail Server, Cypht, Afterlogic WebMail and 11 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 9, 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 GMX Mail: the alternatives its listing names first, then the tools that share the most features with it.