cello.violin.co.th has no MX records.
Question and response
Question
dig cello.violin.co.th. MX
Answer
The response has no answer records.
Authority
violin.co.th. 480 SOA viola.violin.co.th. nip.symphony.net.th. 1401 180 60 240 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0