SHSelfHostIndex

Courier Mail Server vs Kopano Groupware Core

A side-by-side comparison of two self-hosted apps from related categories — 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 KO Kopano Groupware Core Open-source collaboration platform with Outlook support
FeatureCourier Mail ServerKopano Groupware Core
CategoryMail ServersGroupware
LicenseGPL-3.0AGPL-3.0
LanguageCC++
Setup difficultyHardHard
Min. RAM512 MB2,048 MB
Deploymentbare-metal, sourcedocker, bare-metal
GitHub stars★ 13★ 60
First released20002016
ReplacesMicrosoft ExchangeMicrosoft Exchange

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 Kopano Groupware Core if…

  • Released under the AGPL-3.0 license
  • First-class Docker support for quick deployment
  • Written in C++
Kopano Groupware Core details

Frequently asked questions

Is Courier Mail Server or Kopano Groupware Core better?

Neither is universally better. Kopano Groupware Core has the larger community; both share a hard setup difficulty, so the decision comes down to features and licensing.

Are Courier Mail Server and Kopano Groupware Core free and open-source?

Yes. Courier Mail Server is licensed under GPL-3.0 and Kopano Groupware Core under AGPL-3.0. Both can be self-hosted at no software cost.

Can I run Courier Mail Server and Kopano Groupware Core with Docker?

Courier Mail Server: check the project docs for container support. Kopano Groupware Core: yes.

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