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Mail-in-a-Box alternatives

As of Nov 13, 2026, the highest-graded Mail-in-a-Box alternative is mailcow (2.4 GPA). It's also the best free one.

Mail-in-a-Box compared with 5 alternatives: mailcow, Mailu, iRedMail, Modoboa and docker-mailserver.

Mail-in-a-Box is free to use. All 5 alternatives are free or have a free plan.

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

At a glance

ToolPriceFree planRuns on
Mail-in-a-BoxThis toolFreeFreeWeb
mailcowFreeFreeWeb
MailuFreeFreeWeb
iRedMailFree plan · from $499/yrYesLinux
ModoboaFreeFreeWeb
docker-mailserverFreeFreeLinux

Price against what you get

Mail-in-a-Box has no paid plan and scores 2.0 out of 4 on features, ease of use and platforms. None of the 5 alternatives on this chart both scores higher and starts lower.

mailcow scores higher without starting lower.

Features, ease of use and platforms, averaged

D1.0C2.0B3.0A4.0Free$0.5$1$2$5$10$20$50$100More for lessCosts more, scores moreCosts less, scores lessCosts more, scores lessMail-in-a-BoxmailcowMailuiRedMailModoboadocker-mailserver

What paid plans start at, a month (each step along is roughly double) →

  • The best score at each price
  • Has a free plan
  • No free plan
The full chart of email apps, and the best at every price

How each one differs from Mail-in-a-Box

  1. mailcow

    Dockerized open-source mail server with a web admin UI

    • mailcow is free.

    Suits: Admins who want a ready-made self-hosted mail server for a few domains

    mailcow vs Mail-in-a-Boxmailcow pricing and details

  2. Mailu

    Free Docker-based mail server with webmail and admin UI

    • Mailu is free.
    • Mailu also covers dMARC.
    • Mailu does not cover calendar, which Mail-in-a-Box does.

    Suits: Self-hosters who want a lean mail server without groupware extras

    Mailu vs Mail-in-a-BoxMailu pricing and details

  3. iRedMail

    Open-source mail server installer for Linux and BSD

    • iRedMail starts at $499 for a 1-year iRedAdmin-Pro license, $250 per year to renew.
    • iRedMail also lists a Linux app.
    • iRedMail lists no web app, which Mail-in-a-Box has.

    Suits: Admins who want a self-run mail server without per-mailbox fees

    iRedMail vs Mail-in-a-BoxiRedMail pricing and details

  4. Modoboa

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

    • Modoboa is free.

    Suits: Individuals and small organizations that want their own mail server

    Modoboa vs Mail-in-a-BoxModoboa pricing and details

  5. docker-mailserver

    Self-hosted mail server packaged as a Docker container

    • docker-mailserver is free.
    • docker-mailserver also lists a Linux app.
    • docker-mailserver lists no web app, which Mail-in-a-Box has.
    • docker-mailserver does not cover calendar and email client, which Mail-in-a-Box does.

    Suits: Technical users who want a mail server managed as config files

    docker-mailserver vs Mail-in-a-Boxdocker-mailserver pricing and details

Limits worth knowing in Mail-in-a-Box

  • It cannot run on a home connection: it needs a cloud server with a clean IP, so the guide advises renting a virtual machine.
  • It must be installed on a fresh machine dedicated to it, and manual changes after install are overwritten.
  • The page warns that other mail services may block or spam-filter mail sent from your own server.
  • You act as the system administrator and must fix issues yourself; help comes from a forum and chat room.
Mail-in-a-Box pricing and details

Common questions

What are the alternatives to Mail-in-a-Box?

The alternatives to Mail-in-a-Box in this directory are mailcow, Mailu, iRedMail, Modoboa and docker-mailserver. Each one has a side-by-side comparison with Mail-in-a-Box.

Is there a free alternative to Mail-in-a-Box?

Yes. mailcow, Mailu, Modoboa and docker-mailserver are free to use. iRedMail has a free plan alongside paid ones.

Which Mail-in-a-Box alternatives work on Linux?

The Mail-in-a-Box listing does not include a Linux app. iRedMail and docker-mailserver list one.

When were these prices checked?

Every listing on this page was checked on Nov 13, 2026, against the pages it cites. Vendors change prices without notice, so confirm on their site before you buy.

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