You can subsribe to or unsubscribe from Mailman listservers over the web. A list of all public lists can be found here:
Private lists are accessible at that address with "/LISTNAME" appended. Just navigate to the list you want to join or leave, and there will be instructions.
In addition, some options are available through an email interface. To join a list, send an email to
To leave a list, just email
Managing a listserver
Mailman has a fancy web interface so that list owners can modify all aspects of a list: the list's members, whether replies default to a particular person or the entire list, and about 80 other options. Just visit wso.williams.edu/mailman/admin/LISTNAME (where LISTNAME is the name of your list) to see the control panel.