mx0.mail.uk.easynet.net has no CNAME records.
Question and response
Question
dig mx0.mail.uk.easynet.net. NS
Answer
The response has no answer records.
Authority
uk.easynet.net. 3384 SOA ns1.gtt.net. hostmaster.gtt.net. 2026022601 10800 3600 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0