ns2.wtt.net.hk has no MX records.
Question and response
Question
dig ns2.wtt.net.hk. MX
Answer
The response has no answer records.
Authority
wtt.net.hk. 900 SOA ns1.wtt.net.hk. hostmaster.hkbnes.net.hk. 2023022700 1200 120 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0