mailgate.pccw.com has no MX records.
Question and response
Question
dig mailgate.pccw.com. MX
Answer
The response has no answer records.
Authority
pccw.com. 10800 SOA dns3.pccw.com. dnsadmin.pcg-group.com. 2026021201 108000 3600 3600000 108000
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0