b.nic.my has no MX records.
Question and response
Question
dig b.nic.my. MX
Answer
The response has no answer records.
Authority
nic.my. 600 SOA b.nic.my. hostmaster.nic.my. 2020082950 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0