[Mailman-Users] how to disable "lists" display in email

[Catherine Maxwell]

Hello,

When someone sends a request message to our Mailman server with the 
command "lists" it returns a list of mailing lists on the server -- 
even those lists that are set to private. We would like to either 
find out how to make sure private lists are not returned in the 
message or to disable the "lists" command entirely. How do we do that?

Thanks.

--Catherine