Sending a message to a groups.michbar.org list
1) First off, make sure you are a member of the list and that members are allowed to contribute to the list.
2) Using the e-mail account from which you are subscribed simply send an e-mail message to LISTNAME@groups.michbar.org where LISTNAME is the name of the list you are sending to. For instance, Family Law is familylaw@groups.michbar.org.
A list of all publicly available lists and their names is at http://groups.michbar.org