Our mailing lists are managed using GNU Mailman. For comprehensive documentation, see http://www.gnu.org/software/mailman/
Users are able to self service and can use email commands to subscribe or unsubscribe among many other features. Lists may be moderated, so some messages sent to lists may not be sent immediately.
If you would like to know how to turn off the monthly password reminders, some detailed instructions are at http://bill-owens.blogspot.com.au/2012/02/only-you-can-prevent-monthly-mailman.html
If you need the list administrator password reset, this is a manual process. Please ask masonry.