mail01.bchk.com.hk has no MX records.
Question and response
Question
dig mail01.bchk.com.hk. MX
Answer
The response has no answer records.
Authority
bchk.com.hk. 3600 SOA host1.cntech.net. webmaster.bchk.com.hk. 2026021324 1800 900 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0