CIMB.com.sg has no MX records.
Question and response
Question
dig CIMB.com.sg. MX
Answer
The response has no answer records.
Authority
CIMB.com.sg. 300 SOA bhqkpk400206.cimbmy.cimbdomain.com. postmaster.cimb.com. 197 10800 3600 2592000 300
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0