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Open Source Mail-in-a-box Alternatives

The best open source alternative to Mail-in-a-box is Cloudron. If that doesn't suit you, our users have ranked more than 10 alternatives to Mail-in-a-box and 12 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Mail-in-a-box are mailcow: dockerized, Postfix, iRedMail and hMail Server.

Mail-in-a-box alternatives are mainly Mail Servers but may also be Server Management Tools or Web Hosting Services. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Mail-in-a-box.
This page was last updated Feb 8, 2022
  • FreeOpen Source
  • Self-Hosted
  • Roundcube

Easy-to-deploy mail server.

Learn more about Mail-in-a-box

  1. Cloudron is a complete solution for managing apps & users on your own server. Easily deploy production ready apps from the app library and keep them automatically up-to-date. It even comes with a built-in email server and web clients!.

    Currently installed apps grid.
    Cloudron vs Mail-in-a-box opinions
    This alternative is disputed. Cloudron is still a legitimate alternative to Mail-in-a-box, but it might have issues that some users think are important.

    it looks like a full on web control panel for hosting not e-mail specific..

    Negative comment over 1 year ago
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    0

    I didn't really realize I already had a full blown email solution when I installed Cloudron initially. Everything was already setup and ready to go!

    Positive comment almost 2 years ago
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    -1

    Not a email server solution

    Negative comment over 2 years ago
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    0

    Cloudron is not an email server solution

    Negative comment about 3 years ago
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    5
  2. mailcow: dockerized icon

    mailcow: dockerized

    • FreeOpen Source
    • Linux
    • Self-Hosted

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

    Screenshot
    Most users think mailcow: dockerized is a great alternative to Mail-in-a-box.


  3. Postfix icon

    Postfix

    • FreeOpen Source
    • Mac
    • Linux

    Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail. It attempts to be fast, easy to administer, and secure. The software is also known by its former names VMailer and IBM Secure Mailer.

    Screenshot
  4. iRedMail icon

    iRedMail

    • FreemiumOpen Source
    • Linux
    • BSD
    • Self-Hosted

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

    Main components and working process
    Most users think iRedMail is a great alternative to Mail-in-a-box.
  5. hMailServer is a free e-mail server for Microsoft Windows. Its used by Internet service providers, companies, governments, schools and enthusiasts in all parts of the world.

    Screenshot


  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.

    Main Page
  7. Modoboa icon

    Modoboa

    • FreeOpen Source
    • Linux
    • Self-Hosted

    Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface. It provides useful components such as an administration panel or a webmail.

    No screenshots yet
  8. Mailu icon

    Mailu

    • FreeOpen Source
    • Linux
    • Self-Hosted

    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.

    No screenshots yet
  9. Exim icon

    Exim

    • FreeOpen Source
    • Mac
    • Linux

    Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.

    No screenshots yet
  10. Courier-MTA icon

    Courier-MTA

    • FreeOpen Source
    • Mac
    • Linux
    • BSD
    • Self-Hosted

    The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols, such as ESMTP, IMAP, POP3, LDAP, SSL, and HTTP. Courier provides ESMTP, IMAP, POP3, webmail, and mailing list services within a single, consistent, framework.

    No screenshots yet
Showing 10 of 12 alternatives