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Maddy vs Mail-in-a-Box: catalog facts
Maddy	Mail-in-a-Box
Free Free and open source, self-hosted.	Free Free and open source, self-hosted on your own server.
Linux, Self-hosted	Linux, Self-hosted
Single-binary deployment simplifies installation compared to multi-package mail stacks Written in Go with a composable configuration model	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
Smaller community and fewer guides than more established mail servers Still requires Linux server administration to run	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
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.