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docker-mailserver vs Mail-in-a-Box: catalog facts
docker-mailserver	Mail-in-a-Box
Free Free and open source.	Free Free and open source, self-hosted on your own server.
Linux, Self-hosted	Linux, Self-hosted
Whole mail stack in one container Built-in antispam and antivirus	Automates the entire setup of a mail server stack on a single Ubuntu box Open source, so the full setup can be audited and self-hosted
No webmail or graphical admin interface Needs Docker and DNS knowledge to run well	Requires comfort running and maintaining a Linux server Tied specifically to Ubuntu, limiting deployment flexibility
Self-hosted	Self-hosted
Open source	Open source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.