mxin10.virginmedia.com has no CNAME records.
Question and response
Question
dig mxin10.virginmedia.com. NS
Answer
The response has no answer records.
Authority
virginmedia.com. 1800 SOA ns1.virginmedia.net. hostmaster.virginmedia.net. 2025091282 86400 7200 2419200 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0