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Apache James vs Mox: catalog facts
Apache James	Mox
Free Free and open source from the Apache Software Foundation.	Free Free and open source.
Self-hosted	Linux, Self-hosted
Supports modern JMAP alongside SMTP, IMAP and POP3 Mailet container for custom mail processing	Single program covering SMTP, IMAP and webmail Built-in DKIM, SPF, DMARC, MTA-STS and DANE
Requires a Java runtime and some server administration knowledge Distributed setups depend on extra services such as Cassandra	Younger and less widely deployed than Postfix and Dovecot Deliverability still depends on your IP reputation and DNS
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 September 24, 2026

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