ssg.qala.com.sg has no MX records.
Question and response
Question
dig ssg.qala.com.sg. MX
Answer
The response has no answer records.
Authority
ssg.qala.com.sg. 86400 SOA pridns.m1net.com.sg. hostmaster.qala.com.sg. 2011111222 28800 3600 432000 86400
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0