We do not convert Majordomo mailing lists to Mailman or copy that info towards the cPanel & WHM server. If the server has mailing lists, you are able to recreate them with cPanel’s Mailman interface ( Market support contracts to quickly present helpdesk services to your customer. Track time on https://charliepwcdk.theisblog.com/28301208/top-guidelines-of-cpanel-server-support-service