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Exim vs Mox: catalog facts
Exim	Mox
Free Free and open source under the GNU General Public Licence.	Free Free and open source.
Linux, Self-hosted, Command line	Linux, Self-hosted
Very flexible mail routing Extensive checks for incoming mail	Single program covering SMTP, IMAP and webmail Built-in DKIM, SPF, DMARC, MTA-STS and DANE
Configuration is complex and differs from Sendmail A mail server, not a client for reading email	Younger and less widely deployed than Postfix and Dovecot Deliverability still depends on your IP reputation and DNS
Downloadable app, Self-hosted	Self-hosted
Open source	Open source
License: GPL	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 September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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