ns8.mail.in.th has no MX records.
Question and response
Question
dig ns8.mail.in.th. MX
Answer
The response has no answer records.
Authority
mail.in.th. 3600 SOA ns.mail.in.th. hostmaster\.mail.in.th. 2026021521 86400 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0