Lists.wikimedia.org
From Wikitech
Mailing lists live in /home/mailman/.
The templates for list messages etc. are in /home/mailman/template/<langcode>; these can be customised per-list by copying them to /home/mailman/lists/<listname>/<langcode>/ and editing them. Make sure they're still writable by Apache (what group does this require? mailman?) otherwise the mailman web interface doesn't work!
