Postfix vs mailcow
A side-by-side comparison of two self-hosted mail servers options — licensing, setup difficulty, resource needs, and what each one replaces.
mailcow
Dockerized full-stack mail server suite
| Feature | Postfix | mailcow |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 75 · Good | 94 · Excellent |
| Category | Mail Servers | Mail Servers |
| License | IPL-1.0 | GPL-3.0 |
| Language | C | JavaScript |
| Setup difficulty | Hard | Medium |
| Min. RAM | 128 MB | 6,144 MB |
| Deployment | docker, bare-metal, source | docker |
| GitHub stars | ★ 576 | ★ 13,498 |
| First released | 1998 | 2016 |
| Replaces | Microsoft Exchange | Microsoft Exchange, Google Workspace |
What are Postfix and mailcow?
Postfix
Postfix is a widely deployed mail transfer agent that routes and delivers email. It is the SMTP backbone of countless self-hosted mail servers thanks to its security and performance.
- High-performance SMTP server
- Strong security architecture
- Flexible routing and policy
- De facto standard MTA
mailcow
mailcow is a complete, Docker-based mail server solution that bundles Postfix, Dovecot, Rspamd, SOGo, and a modern web UI. It makes running a full-featured mail server with antispam and webmail straightforward.
- Complete Docker mail stack
- Rspamd antispam built in
- SOGo webmail and ActiveSync
- Modern management UI with API
Postfix vs mailcow: key differences
Postfix is written in C, while mailcow is built with JavaScript. Licensing differs — IPL-1.0 for Postfix versus GPL-3.0 for mailcow. Postfix is the lighter option, starting around 128 MB of RAM against 6,144 MB for mailcow. Postfix is the more established project (first released 1998), while mailcow arrived in 2016. Mailcow has the considerably larger community, at 13,498 GitHub stars versus 576.
Why pick each one
Choose Postfix if…
- Battle-tested and stable
- Extensive documentation
Watch out for
- Configuration has a steep curve
- Only handles mail transfer
Choose mailcow if…
- All components preconfigured
- Active community
Watch out for
- Substantial RAM requirements
- Many containers to manage
Frequently asked questions
Is Postfix or mailcow better?
mailcow is the stronger all-round pick: it has both the larger community and the simpler medium setup. Consider Postfix if its specific feature set fits your needs better.
Are Postfix and mailcow free and open-source?
Yes. Postfix is licensed under IPL-1.0 and mailcow under GPL-3.0. Both can be self-hosted at no software cost.
Can I run Postfix and mailcow with Docker?
Postfix: yes. mailcow: yes.
Which is lighter on resources, Postfix or mailcow?
Postfix has the smaller minimum footprint at 128 MB of RAM, compared to about 6,144 MB for mailcow. Real-world usage depends on library size, user count, and enabled features.