iRedMail vs Postfix
A side-by-side comparison of two self-hosted mail servers options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | iRedMail | Postfix |
|---|---|---|
| Deploy effort | Read-the-docs project | Under-an-hour setup |
| Health score | 82 · Excellent | 75 · Good |
| Category | Mail Servers | Mail Servers |
| License | GPL-3.0 | IPL-1.0 |
| Language | Shell | C |
| Setup difficulty | Medium | Hard |
| Min. RAM | 4,096 MB | 128 MB |
| Deployment | bare-metal | docker, bare-metal, source |
| GitHub stars | ★ 1,844 | ★ 576 |
| First released | 2007 | 1998 |
| Replaces | Microsoft Exchange, Google Workspace | Microsoft Exchange |
What are iRedMail and Postfix?
iRedMail
iRedMail is a shell-script-driven mail server deployment that sets up Postfix, Dovecot, antispam, and webmail on major Linux and BSD systems. It supports OpenLDAP, MySQL, or PostgreSQL backends.
- Automated full mail stack install
- LDAP, MySQL or PostgreSQL backends
- SpamAssassin and ClamAV
- Roundcube and SOGo webmail
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
iRedMail vs Postfix: key differences
IRedMail is written in Shell, while Postfix is built with C. Licensing differs — GPL-3.0 for iRedMail versus IPL-1.0 for Postfix. Postfix is the lighter option, starting around 128 MB of RAM against 4,096 MB for iRedMail. Postfix is the more established project (first released 1998), while iRedMail arrived in 2007. IRedMail has the considerably larger community, at 1,844 GitHub stars versus 576. Postfix lists first-class Docker deployment; iRedMail does not.
Why pick each one
Choose iRedMail if…
- Works on many distros
- Long-standing project
Watch out for
- Admin panel features gated in pro edition
- Script-based, less reproducible
Choose Postfix if…
- Battle-tested and stable
- Extensive documentation
Watch out for
- Configuration has a steep curve
- Only handles mail transfer
Frequently asked questions
Is iRedMail or Postfix better?
iRedMail 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 iRedMail and Postfix free and open-source?
Yes. iRedMail is licensed under GPL-3.0 and Postfix under IPL-1.0. Both can be self-hosted at no software cost.
Can I run iRedMail and Postfix with Docker?
iRedMail: check the project docs for container support. Postfix: yes.
Which is lighter on resources, iRedMail or Postfix?
Postfix has the smaller minimum footprint at 128 MB of RAM, compared to about 4,096 MB for iRedMail. Real-world usage depends on library size, user count, and enabled features.