iRedMail vs Exim
A side-by-side comparison of two self-hosted mail servers options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | iRedMail | Exim |
|---|---|---|
| Deploy effort | Read-the-docs project | Read-the-docs project |
| Health score | 82 · Excellent | 15 · At risk |
| Status | Actively maintained | Archived |
| Category | Mail Servers | Mail Servers |
| License | GPL-3.0 | GPL-2.0 |
| Language | Shell | C |
| Setup difficulty | Medium | Hard |
| Min. RAM | 4,096 MB | 64 MB |
| Deployment | bare-metal | bare-metal, source |
| GitHub stars | ★ 1,844 | ★ 785 |
| First released | 2007 | 1995 |
| Replaces | Microsoft Exchange, Google Workspace | Microsoft Exchange |
What are iRedMail and Exim?
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
Exim
Exim is a highly configurable mail transfer agent used to route and deliver email on Unix systems. It powers a large share of the internet's mail servers and supports extensive policy and ACL controls.
- Powerful routing rules
- ACL-based policy
- Wide platform support
- Mature codebase
iRedMail vs Exim: key differences
The biggest difference is maintenance: Exim's repository is archived and no longer developed, while iRedMail is actively maintained. IRedMail is written in Shell, while Exim is built with C. Licensing differs — GPL-3.0 for iRedMail versus GPL-2.0 for Exim. Exim is the lighter option, starting around 64 MB of RAM against 4,096 MB for iRedMail. Exim is the more established project (first released 1995), while iRedMail arrived in 2007. IRedMail has the considerably larger community, at 1,844 GitHub stars versus 785.
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 Exim if…
- Extremely flexible
- Proven at scale
Watch out for
- Complex configuration
- Easy to misconfigure
Frequently asked questions
Is iRedMail or Exim better?
iRedMail is the stronger all-round pick: it has both the larger community and the simpler medium setup. Consider Exim if its specific feature set fits your needs better.
Are iRedMail and Exim free and open-source?
Yes. iRedMail is licensed under GPL-3.0 and Exim under GPL-2.0. Both can be self-hosted at no software cost.
Can I run iRedMail and Exim with Docker?
iRedMail: check the project docs for container support. Exim: check the project docs for container support.
Which is lighter on resources, iRedMail or Exim?
Exim has the smaller minimum footprint at 64 MB of RAM, compared to about 4,096 MB for iRedMail. Real-world usage depends on library size, user count, and enabled features.