gateway.throughwave.co.th has no MX records.
Question and response
Question
dig gateway.throughwave.co.th. MX
Answer
The response has no answer records.
Authority
throughwave.co.th. 3600 SOA dns1.throughwave.co.th. root.dns1.throughwave.co.th. 2026022703 3600 600 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0