Mailing lists are a powerful form of communicating with your visitors. Mailing lists are generally used for the distribution of site newsletters or e-mail discussion forums. Most providers, especially UNIX and Linux plans, offer Majordomo as the mailing list program. Majordomo is very hard to learn and use. We don't recommend you to spend time learning it. There are many independent websites that offer mailing list for your site that are inexpensive or free and have many features.