GNU Mailman is free software for managing email discussions and newsletters. Users can manage their accounts through a web interface, subscribing to lists and viewing the archived postings. List owners can also administer their mailing lists through the web. Mailman supports built-in archiving, automatic bounce processing, content filtering, digest delivery, spam filters, REST-based API and more.
Mailman 3 is an evolution of the ever popular mailing list management system that runs thousands of mailing lists around the world. For more information, please visit https://www.list.org/.