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mlmmj vs Schleuder: catalog facts
mlmmj	Schleuder
Free Free and open source under the MIT licence.	Free Free and open source under the GPL-3.0 licence.
Self-hosted, Command line	Self-hosted
Very low resource use with no daemons Works with Postfix, Exim, qmail and sendmail	OpenPGP encryption for group email Can send and receive mail to and from non-subscribers
Deliberately minimal feature set Configured from the command line and files rather than a full web admin	Members need to manage OpenPGP keys Requires running your own mail server
Self-hosted	Self-hosted
Open source	Open source
License: MIT	License: GPL-3.0
Not stated if an account is 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 October 2, 2026

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