cust-spf.etherned.nl has no MX records.
Question and response
Question
dig cust-spf.etherned.nl. MX
Answer
The response has no answer records.
Authority
etherned.nl. 3600 SOA ns1.argewebhosting.eu. hostmaster.argeweb.nl. 2025092901 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0