This was a mods, which has been deprecated a long time ago. If this is useful to anyone, let's review old code and add something to Tiki core or as a profile. Rest of page kept for posterity.

Mod mailman

Mailman is free software for managing electronic mail discussion and e-newsletter lists. Mailman is integrated with the web, making it easy for users to manage their accounts and for list owners to administer their lists. Mailman supports built-in archiving, automatic bounce processing, content filtering, digest delivery, spam filters, and more. See its features page for more details (http://www.gnu.org/software/mailman/features.html)