stmp.hughes.net
That should be smtp.hughes.net. But this isn't an Apple problem. Hughes had to have changed something on their servers, such as requiring password authentication or SSL on a different port. They need to tell you what the problem is; merely blaming Apple is an excuse for them to avoid supporting their customers.
I'd call them up and talk to a supervisor or a manager and have them go through all your settings to be sure everything is correct.
Mulder