If you would like the existence of your mailing list to be hidden, you can choose to hide your mailing list. A hidden mailing list does not appear in the web interface menus, and does
not appear in the "lists" email command. Mailing List Information.
The web interface pages for a hidden mailing list are still available, if you use the direct URLs to go to them. For example, the join= and enter= pages are still there, but the user needs to be
pointed directly to them. See How to go directly to "Enter Mailing List" page or How to go directly the "Join Mailing List" page