A user can obtain a list of the users subscribed to a list by addressing a message to the list server (for example, imailsrv@domain.com ) and issuing the list listname command in the body of the message. Select the Disable List Command option if you do not want users to receive a list of the subscribers to your list-server mailing list.
Note: List owners will always be able to receive a list of subscribers regardless of the list type. This is true even if the Disable List Command option is selected.