edm.commercial.pccw.com has no MX records.
Question and response
Question
dig edm.commercial.pccw.com. MX
Answer
The response has no answer records.
Authority
commercial.pccw.com. 10800 SOA dns3.pccw.com. dnsadmin.pcg-group.com. 2015072702 28800 14400 3600000 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0