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Mail-in-a-Box vs Mailcow: catalog facts
Mail-in-a-Box	Mailcow
Free Free and open source, self-hosted on your own server.	Free Free and open source, self-hosted.
Linux, Self-hosted	Linux, Self-hosted
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	Docker packaging makes deployment and updates more manageable Includes a full web admin panel and SOGo webmail out of the box
Requires comfort running and maintaining a Linux server Tied specifically to Ubuntu, limiting deployment flexibility	Requires Docker and server administration knowledge to run Resource requirements are higher than a single lightweight mail daemon
Self-hosted	Self-hosted
Open source	Open source
License not stated	License not stated
Not stated if an account is 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 22, 2026	Official website Full listing and sources Checked September 22, 2026

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