Three popular self-hosted suites — pick by team size and how much control you need.
| Feature | Mailcow | Mail-in-a-Box | iRedMail |
|---|---|---|---|
| Packaging | Docker compose | Bare-metal Ubuntu installer | Bare-metal installer |
| Admin UI | Modern React-style | Minimal | Basic + paid Pro |
| Webmail | SOGo | Roundcube | Roundcube |
| DKIM | Auto via Rspamd | Auto via OpenDKIM | OpenDKIM |
| Anti-spam | Rspamd (modern) | SpamAssassin | SpamAssassin/Amavis |
| Multi-domain | Excellent | Limited | Good |
| HA / clustering | Possible, manual | No | Pro only |
| Updates | ./update.sh |
OS package | Manual |
| License | GPLv3 | CC0 | GPL + paid extras |
Choose Mailcow when: you want the modern stack, comfortable with Docker, need multi-domain and rich admin UI.
Choose Mail-in-a-Box when: you want one mailbox for one domain on one tiny VPS and never touch it again.
Choose iRedMail when: you specifically need Amavis/SpamAssassin compatibility or already manage Postfix by hand.
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