making a mailing list

Doing a search on web site mailing list provides many results. They've been developed in a number of programming languages. Just depends on your needs, mainly in the number of people you expect to have on the list. You'll likely find yourself signing up on a site to do this so it runs on someone else's server as running it from your server can get you blacklisted (and thus blocked emails) if you don't know how to set things up.