Either you own a maching 24 h connected to the internet, then you can download Listserv lite (http://www.lsoft.com/) and install it. Or if you have a Linux-Server installed as road-warrior (a machine only temporarily connected) then you can get it working too with some tweaks. If you have none of those two then you must use a commercial provider (http://www.onelist.com/, http://www.listbot.com/)