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Apache James vs Courier Mail Server: catalog facts
Apache James	Courier Mail Server
Free Free and open source from the Apache Software Foundation.	Free Free and open-source software.
Self-hosted	Linux, Self-hosted
Supports modern JMAP alongside SMTP, IMAP and POP3 Mailet container for custom mail processing	SMTP, IMAP, POP3, webmail and mailing lists in one package Components can be switched on or off individually
Requires a Java runtime and some server administration knowledge Distributed setups depend on extra services such as Cassandra	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: Apache-2.0	License not stated
No account needed	No account 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 October 2, 2026

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