gate1.ncs.com.sg has no MX records.
Question and response
Question
dig gate1.ncs.com.sg. MX
Answer
The response has no answer records.
Authority
ncs.com.sg. 900 SOA ns-1164.awsdns-17.org. dnsadmin.ncs.com.sg. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0