mgw.kpnxchange.com has no MX records.
Question and response
Question
dig mgw.kpnxchange.com. MX
Answer
The response has no answer records.
Authority
kpnxchange.com. 86400 SOA ns13.kpn.net. zonemaster.kpn.com. 2026030501 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0