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Mailcow vs Poste.io: catalog facts
Mailcow	Poste.io
Free Free and open source, self-hosted.	Freemium Free for personal use with paid licensing for larger deployments.
Linux, Self-hosted	Linux, Self-hosted
Docker packaging makes deployment and updates more manageable Includes a full web admin panel and SOGo webmail out of the box	Single Docker container simplifies deployment of a full mail stack Includes web admin, webmail, and TLS handling out of the box
Requires Docker and server administration knowledge to run Resource requirements are higher than a single lightweight mail daemon	Free tier is limited, with paid licensing for larger deployments Requires Docker knowledge and a server to run
Self-hosted	Self-hosted
Open source	Closed 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.