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Mailu vs Cyrus IMAP: catalog facts
Mailu	Cyrus IMAP
Free Free and open source.	Free Free and open source.
Linux, Self-hosted	Linux, Self-hosted
Webmail and admin interface included Per-domain delegation and quotas	Mail, calendars and contacts in one server JMAP support alongside IMAP
Requires Docker Releases are infrequent	Complex to configure compared with all-in-one servers No bundled webmail
Self-hosted	Self-hosted
Open source	Open source
License not stated	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.