Besides, I guarantee someone out there just created a new one as you're reading this. Just assume there there is a mailing list for whatever your personal interest may be. For example, I'm on a ghost stories discussion list. Trust me, there are stranger lists out there. For you workaholics, there are plenty of profession-oriented mailing lists, in which you can exchange ideas with those who do the same job you do every day.
Many support groups have mailing lists, too.
Perfect if you need a friend when times get tough. The most difficult part is finding the mailing list that is right for you. You can start, as everything on the Internet generally does, with search engines. In addition, there are several sites devoted to mailing lists and how to find them. Like everything on the Internet, there's a good and a bad side to mailing lists.