mailcow vs Sendy
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
Sendy
Self-hosted email newsletter application that lets you send bulk
| Feature | mailcow | Sendy |
|---|---|---|
| Category | Mail Servers | Mail Servers |
| License | GPL-3.0 | ⊘ Proprietary |
| Language | JavaScript | PHP |
| Setup difficulty | Medium | Medium |
| Min. RAM | 6,144 MB | 512 MB |
| Deployment | docker | bare-metal |
| GitHub stars | ★ 13,245 | — |
| First released | 2016 | 2020 |
| Replaces | Microsoft Exchange, Google Workspace | — |
Why pick each one
Choose Sendy if…
- Released under the ⊘ Proprietary license
- Written in PHP
- Lightweight — runs in 512 MB RAM
Frequently asked questions
Is mailcow or Sendy 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 Sendy free and open-source?
Yes. mailcow is licensed under GPL-3.0 and Sendy under ⊘ Proprietary. Both can be self-hosted at no software cost.
Can I run mailcow and Sendy with Docker?
mailcow: yes. Sendy: check the project docs for container support.