Try port 465 to send to smtp.hughes.net; port 995 to receive from mail.hughes.net.
I also assume you meant 'SSL on' instead of 'SSL no', as I think the new email requires SSL.
Those ports should only be valid if SSL is on, and quite frankly, not sure why they would tell you otherwise.
Few email services are operating with non-SSL email access (for good reason), and Hughes recently moved theirs from Senacor to someone who uses Oracle Cloud. Tech Support likely didn't get the memo.
I also had this issue using Thunderbird. With hn support on the phone, I changed to port 465 and all is working. Hn said that should throw an error. So they are aware of the issue.