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Schleuder vs Sympa: catalog facts
Schleuder	Sympa
Best for: Groups that need an encrypted shared email address	Best for: Organisations running many large mailing lists on their own servers
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the GPL-2.0 licence.
Self-hosted	Self-hosted, Command line
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	Designed for lists with tens of thousands of subscribers Handles subscription, moderation and archives in one package All 4 strengths for Sympa Designed for lists with tens of thousands of subscribers Handles subscription, moderation and archives in one package Web interface with message archives Supports DKIM signing and ARC sealing
Members need to manage OpenPGP keys Requires running your own mail server	Requires running and configuring your own mail server Setup is aimed at experienced system administrators
Self-hosted	Self-hosted
Open source	Open source
License: GPL-3.0	License: GPL-2.0
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 Sympa sympa.community github.com/sympa-community/sympa Catalog checked October 2, 2026

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