Major Major is a mailing list manager for OS/2. It lets you create multiple mailing lists on your machine. People subscribe to these lists by mailing a "subscribe" command to Major Major. (There is also an "unsubscribe" command.) You can also subscribe/unsubscribe people in your role as system manager.

To make this work, you have to be able to create e-mail accounts. You need one e-mail account for Major Major itself, plus one per list that you host. This means that you need to have access to an e-mail server. You can install an e-mail server such as Weasel on your own computer. Alternatively, you can use the e-mail server of your ISP or other mail provider, and ask that provider to create the appropriate accounts.