Docker Mailserver vs iRedMail
A side-by-side comparison of two self-hosted mail servers options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Docker Mailserver | iRedMail |
|---|---|---|
| Deploy effort | ≈5-minute setup | Read-the-docs project |
| Health score | 96 · Excellent | 82 · Excellent |
| Category | Mail Servers | Mail Servers |
| License | MIT | GPL-3.0 |
| Language | Shell | Shell |
| Setup difficulty | Medium | Medium |
| Min. RAM | 2,048 MB | 4,096 MB |
| Deployment | docker | bare-metal |
| GitHub stars | ★ 18,872 | ★ 1,844 |
| First released | 2015 | 2007 |
| Replaces | Google Workspace, Microsoft 365 | Microsoft Exchange, Google Workspace |
What are Docker Mailserver and iRedMail?
Docker Mailserver
Docker Mailserver is a single-container mail server built on Postfix and Dovecot with no external database. It is configured entirely through files and environment variables for a reproducible setup.
- Single container, no database
- Postfix and Dovecot core
- SpamAssassin and ClamAV integration
- File-based configuration
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
Docker Mailserver vs iRedMail: key differences
Both projects are written in Shell. Licensing differs — MIT for Docker Mailserver versus GPL-3.0 for iRedMail. Docker Mailserver is the lighter option, starting around 2,048 MB of RAM against 4,096 MB for iRedMail. IRedMail is the more established project (first released 2007), while Docker Mailserver arrived in 2015. Docker Mailserver has the considerably larger community, at 18,872 GitHub stars versus 1,844. Docker Mailserver lists first-class Docker deployment; iRedMail does not.
Why pick each one
Choose Docker Mailserver if…
- Reproducible, version-controllable config
- Lightweight
Watch out for
- No built-in webmail
- Requires comfort with mail concepts
Choose iRedMail if…
- Works on many distros
- Long-standing project
Watch out for
- Admin panel features gated in pro edition
- Script-based, less reproducible
Frequently asked questions
Is Docker Mailserver or iRedMail better?
Neither is universally better. Docker Mailserver has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are Docker Mailserver and iRedMail free and open-source?
Yes. Docker Mailserver is licensed under MIT and iRedMail under GPL-3.0. Both can be self-hosted at no software cost.
Can I run Docker Mailserver and iRedMail with Docker?
Docker Mailserver: yes. iRedMail: check the project docs for container support.
Which is lighter on resources, Docker Mailserver or iRedMail?
Docker Mailserver has the smaller minimum footprint at 2,048 MB of RAM, compared to about 4,096 MB for iRedMail. Real-world usage depends on library size, user count, and enabled features.