Create a new mailman list using Cpanel
Change the settings of the new list. In general settings, under the heading Reply-To: header munging ought to be changed to a generic (non-personal) email address. The message size ought to be increased to 200K or so.
Under privacy settings, change so that only list admin can see the list of subscribers.
Under sender filters under privacy, make sure moderation is on by default
General
Admin notice
Strip sender etc.
Notifications
Additional settings
Non-digest options
Digest options
Privacy
Advertise this list when people ask what lists are on this machine? No
What steps are required for subscription? Confirm and approve
Who can view subscription list? List admin only
Privacy → Sender filters
Default moderated
(default action)
Privacy → Recipient filters
Archiving options