dns03.chief.net.tw has no MX records.
Question and response
Question
dig dns03.chief.net.tw. MX
Answer
The response has no answer records.
Authority
chief.net.tw. 3600 SOA dns01.chief.net.tw. root.chief.net.tw. 2025021901 28800 7200 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0