We have installed the open-source Mailman mailing list software on our server. This enables us to quickly and easily create community mailing lists for a variety of purposes and audiences. Sending eMail to list subscribers is simple, and automation handles the drudgery of maintaining subscriber lists. Your lists will each have their own home page (as will each subscriber), so folks will be able to locate and self-subscribe to your list. You need not know subscribers’ eMail addresses, worry about bounced eMails, etc.
In general, the way mailing lists work is you send an eMail to the list address, and it automatically rebroadcasts it to the list subscribers. The list does not disclose the eMail addresses of subscribers when sending out messages (except that of the message sender).
With Mailman, users can manage their subscription via a web interface (or through eMail, if they prefer). This includes changing eMail addresses, various list options, or unsubscribing. Please see Mailing List Guide for Users or the Mailman documentation for details.