freehost173.inter.net.th has no MX records.
Question and response
Question
dig freehost173.inter.net.th. MX
Answer
The response has no answer records.
Authority
inter.net.th. 3600 SOA ns01.inet.co.th. hostmaster.inet.co.th. 1510042905 21600 3600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0