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GNU Mailman vs Schleuder: catalog facts
GNU Mailman	Schleuder
Free Free software under the GNU General Public License, supported by donations.	Free Free and open source under the GPL-3.0 licence.
Self-hosted	Self-hosted
Web interface for subscribers and list owners Built-in archiving, digests and bounce processing	OpenPGP encryption for group email Can send and receive mail to and from non-subscribers
Needs a mail server and some administration skill to deploy Mailman 3 is split into several components that must be installed together	Members need to manage OpenPGP keys Requires running your own mail server
Self-hosted	Self-hosted
Open source	Open source
License: GPL-3.0	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.