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Courier Mail Server vs Mailcow: catalog facts
Courier Mail Server	Mailcow
Free Free and open-source software.	Free Free and open source, self-hosted.
Linux, Self-hosted	Linux, Self-hosted
SMTP, IMAP, POP3, webmail and mailing lists in one package Components can be switched on or off individually	Docker packaging makes deployment and updates more manageable Includes a full web admin panel and SOGo webmail out of the box
Built from source on POSIX systems, with no Windows support Calendaring in the webmail is basic	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
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 October 2, 2026	Official website Full listing and sources Checked September 22, 2026

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