mail8495.comms.npower.com has no CNAME records.
Question and response
Question
dig mail8495.comms.npower.com. NS
Answer
The response has no answer records.
Authority
npower.com. 3600 SOA ns0009.secondary.cloudflare.com. hostmaster.adacor.net. 2026022300 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0