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Schleuder vs GNU Mailman: catalog facts
Schleuder	GNU Mailman
Best for: Groups that need an encrypted shared email address	Best for: Communities and projects hosting their own email discussion lists
Free Free and open source under the GPL-3.0 licence.	Free Free software under the GNU General Public License, supported by donations.
Self-hosted	Self-hosted
OpenPGP encryption for group email Can send and receive mail to and from non-subscribers All 3 strengths for Schleuder OpenPGP encryption for group email Can send and receive mail to and from non-subscribers Separate documentation for subscribers, list admins and server admins	Web interface for subscribers and list owners Built-in archiving, digests and bounce processing All 4 strengths for GNU Mailman Web interface for subscribers and list owners Built-in archiving, digests and bounce processing Content and spam filtering Long-established GNU project
Members need to manage OpenPGP keys Requires running your own mail server	Needs a mail server and some administration skill to deploy Mailman 3 is split into several components that must be installed together
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 Sources for Schleuder schleuder.org Catalog checked October 2, 2026	Official website Full listing and sources Sources for GNU Mailman list.org Catalog checked October 2, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.