dynamic.hinet.net has no MX records.
Question and response
Question
dig dynamic.hinet.net. MX
Answer
The response has no answer records.
Authority
dynamic.hinet.net. 3600 SOA ipdns1.hinet.net. hostmaster.hinet.net. 1970010100 3600 900 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0