mx1.evonet.be has no CNAME records.
Question and response
Question
dig mx1.evonet.be. NS
Answer
The response has no answer records.
Authority
evonet.be. 3411 SOA ns1.evonet.be. hostmaster.evonet.be. 2026020204 21600 7200 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0