lists.freedesktop.org runs old version of mailman, behind on security updates
https://lists.freedesktop.org/mailman/listinfo/ runs an old version of mailman, "version 2.1.29" released 2018.
The latest version (from the 2.1 branch) is 2.1.39, released December 2021, includes several security fixes https://bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/NEWS
Edited by M Hickford