mx1.victorbuckservices.com has no CNAME records.
Question and response
Question
dig mx1.victorbuckservices.com. NS
Answer
The response has no answer records.
Authority
victorbuckservices.com. 3600 SOA ns1.eurodns.com. hostmaster.eurodns.com. 2026022700 43200 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0