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Mailcow vs Courier Mail Server: catalog facts
Mailcow	Courier Mail Server
Free Free and open source, self-hosted.	Free Free and open-source software.
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	SMTP, IMAP, POP3, webmail and mailing lists in one package Components can be switched on or off individually
Requires Docker and server administration knowledge to run Resource requirements are higher than a single lightweight mail daemon	Built from source on POSIX systems, with no Windows support Calendaring in the webmail is basic
Self-hosted	Self-hosted
Open source	Open source
License not stated	License not stated
Not stated if an account is needed	No account 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 October 2, 2026

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