mx.hughes.net has no MX records.
Question and response
Question
dig mx.hughes.net. MX
Answer
The response has no answer records.
Authority
hughes.net. 1800 SOA ns1.hns.com. no_email.hughes.com. 307 300 3600 432000 3600
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0