Mailman3 vs Postorius
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?
| Feature | Mailman3 | Postorius |
|---|---|---|
| Category | Chat & Communication | Mail Servers |
| License | AGPL-3.0-or-later | GPL-3.0 |
| Language | Python | |
| Setup difficulty | Medium | Hard |
| Min. RAM | 800 MB | 512 MB |
| Deployment | bare-metal | docker, source |
| GitHub stars | — | ★ 200 |
| First released | 2023 | 2012 |
| Replaces | Google Groups | Google Groups |
Why pick each one
Choose Postorius if…
- Released under the GPL-3.0 license
- First-class Docker support for quick deployment
- Written in Python
- Lightweight — runs in 512 MB RAM
Frequently asked questions
Is Mailman3 or Postorius better?
Neither is universally better. Postorius has the larger community, while Mailman3 is simpler to set up (medium difficulty). Choose based on the comparison table above and your own setup.
Are Mailman3 and Postorius free and open-source?
Yes. Mailman3 is licensed under AGPL-3.0-or-later and Postorius under GPL-3.0. Both can be self-hosted at no software cost.
Can I run Mailman3 and Postorius with Docker?
Mailman3: check the project docs for container support. Postorius: yes.