mx.easynet.nl has no CNAME records.
Question and response
Question
dig mx.easynet.nl. NS
Answer
The response has no answer records.
Authority
easynet.nl. 3436 SOA ns1.gtt.net. hostmaster.gtt.net. 2026021901 10800 3600 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0