Mailster

Mailster makes it easy to build upon existing communities of Joomla users and user groups. This and the ability to have non-Joomla-users subscribers as well enables fast and reliable communication. Similar to programs like Mailman or Listserv this extension allows you to run a discussion mailing list. Any mail send to the mailing list email address is forwarded to the rest of the members of the group. When members reply to such emails Mailster again forwards them to the other list recipients.

You choose one email address, no matter if it is located at your own mailing server or at a free email service. The only prerequisite: it is possible to access the mails through one of the standard protocols POP or IMAP.