mx.cloud-ips.co.uk has no CNAME records.
Question and response
Question
dig mx.cloud-ips.co.uk. NS
Answer
The response has no answer records.
Authority
cloud-ips.co.uk. 2736 SOA dns.cloud-ips.co.uk. hostmaster.cloud-ips.co.uk. 1521343574 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0