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GNU Mailman vs Sympa: catalog facts
GNU Mailman	Sympa
Free Free software under the GNU General Public License, supported by donations.	Free Free and open source under the GPL-2.0 licence.
Self-hosted	Self-hosted, Command line
Web interface for subscribers and list owners Built-in archiving, digests and bounce processing	Designed for lists with tens of thousands of subscribers Handles subscription, moderation and archives in one package
Needs a mail server and some administration skill to deploy Mailman 3 is split into several components that must be installed together	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 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.