dyn.kabeltex.nl has no MX records.
Question and response
Question
dig dyn.kabeltex.nl. MX
Answer
The response has no answer records.
Authority
dyn.kabeltex.nl. 3600 SOA dnsauth1.kabeltex.nl. administratie.kabeltex.nl. 2018100095 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0