authsmtp02.pccwmobile.com has no MX records.
Question and response
Question
dig authsmtp02.pccwmobile.com. MX
Answer
The response has no answer records.
Authority
pccwmobile.com. 10800 SOA dns3.pccw.com. dnsadmin.pcg-group.com. 2021073000 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0