As Site Administrator, you can use the Site Administrator control panel to manually add members to mailing lists on your domain. In addition, email users can subscribe to mailing lists by sending commands to the Majordomo server through email messages.
To add members to a mailing list:
Majordomo sends an introductory message to each new member on the list, and also sends an email message to the List Maintainer informing the administrator that a new member is added to the list.