Mailman, the GNU Mailing List Manager 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 the featur
![GNU Mailman](https://cdn-ak-scissors.b.st-hatena.com/image/square/f0a888d23937c1e7870a1e8fc84646b21d2ac336/height=288;version=1;width=512/https%3A%2F%2Fwww.gnu.org%2Fsoftware%2Fmailman%2Fimages%2Flogo2010-2.jpg)