mailcow vs OpenTrashmail
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?
mailcow
Dockerized full-stack mail server suite
VS
OpenTrashmail
Complete trashmail solution that exposes an SMTP server and has a web
| Feature | mailcow | OpenTrashmail |
|---|---|---|
| Category | Mail Servers | Mail Servers |
| License | GPL-3.0 | Apache-2.0 |
| Language | JavaScript | PHP |
| Setup difficulty | Medium | Medium |
| Min. RAM | 6,144 MB | 512 MB |
| Deployment | docker | docker |
| GitHub stars | ★ 13,245 | ★ 919 |
| First released | 2016 | 2020 |
| Replaces | Microsoft Exchange, Google Workspace | — |
Why pick each one
Choose OpenTrashmail if…
- Released under the Apache-2.0 license
- First-class Docker support for quick deployment
- Written in PHP
- Lightweight — runs in 512 MB RAM
Frequently asked questions
Is mailcow or OpenTrashmail better?
Neither is universally better. mailcow has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are mailcow and OpenTrashmail free and open-source?
Yes. mailcow is licensed under GPL-3.0 and OpenTrashmail under Apache-2.0. Both can be self-hosted at no software cost.
Can I run mailcow and OpenTrashmail with Docker?
mailcow: yes. OpenTrashmail: yes.