I wrote something using PHP/MySQL.
It wasn't an address, but it is an online form that members of the list can login and use to send a message to all the other people on the list. I did it this way (rather than using a simple email address that forwards to everyone in the hopes that it would drive people consistently to the site not only for this feature but for other news, too...)
It was acutally pretty easy.
Once people login, they can modify their settings / remove themselves from the list...
And, the person sending the message never sees the recipients of the message...
Do you know MySQL?