If you previously hosted a mailing list on Fyodor, our old machine, then file a request at Our bug-tracker, using the Mailman component. Be sure to tell us what the name of your list is.
If you haven't hosted a mailing list with us before, it is still possible to migrate a list over to our machines, provided that you have an mbox file containing the archives, and the file config.pck containing your settings. File a request at Our bug-tracker, using the Mailman component, and we will help you out.