Someone suspected that Windows reset the settings in the most recent update. Double check your settings, they should be as follows:
Incoming mail settings:
server: mail.hughes.net
port: 995
"Use SSL" should be checked
authentication should also be set to your username and password.
Outgoing mail settings:
server: smtp.hughes.net
port: 465
"Use SSL" should be checked
authentication should also be set to your username and password.
* Disclaimer: I am a HughesNet customer and not a HughesNet employee. All of my comments are my own and do not necessarily represent HughesNet in any way.
