SHSelfHostIndex

Courier Mail Server vs Mail-in-a-Box

A side-by-side comparison of two self-hosted mail servers options — licensing, setup difficulty, resource needs, and what each one replaces.

Not the right match-up?
CO Courier Mail Server Integrated mail server with IMAP, POP, and webmail VS MA Mail-in-a-Box Turn a fresh server into a working mail server
FeatureCourier Mail ServerMail-in-a-Box
CategoryMail ServersMail Servers
LicenseGPL-3.0CC0-1.0
LanguageCPython
Setup difficultyHardEasy
Min. RAM512 MB1,024 MB
Deploymentbare-metal, sourcebare-metal, one-click
GitHub stars★ 13★ 15,385
First released20002014
ReplacesMicrosoft ExchangeGoogle Workspace, Microsoft 365

Why pick each one

Choose Courier Mail Server if…

  • Released under the GPL-3.0 license
  • Written in C
  • Lightweight — runs in 512 MB RAM
Courier Mail Server details

Choose Mail-in-a-Box if…

  • Very beginner-friendly
  • Opinionated, complete stack
Mail-in-a-Box details

Frequently asked questions

Is Courier Mail Server or Mail-in-a-Box better?

Mail-in-a-Box is the stronger all-round pick: it has both the larger community and the simpler easy setup. Consider Courier Mail Server if its specific feature set fits your needs better.

Are Courier Mail Server and Mail-in-a-Box free and open-source?

Yes. Courier Mail Server is licensed under GPL-3.0 and Mail-in-a-Box under CC0-1.0. Both can be self-hosted at no software cost.

Can I run Courier Mail Server and Mail-in-a-Box with Docker?

Courier Mail Server: check the project docs for container support. Mail-in-a-Box: check the project docs for container support.

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