Mailman Free Download -

: Built-in archiving, automatic bounce processing, content filtering, and integrated spam filters.

This is free, open-source software used by organizations to manage electronic mailing lists and e-newsletters. It is written in Python and distributed under the GNU General Public License. Mailman Free Download

“mails out user passwords in plaintext every month by default. Insane. Old school mailing list software.” SourceForge On MailmanHQ (Gmail Plugin) : Built-in archiving