mail.caen.webhelp.fr has no CNAME records.
Question and response
Question
dig mail.caen.webhelp.fr. NS
Answer
The response has no answer records.
Authority
webhelp.fr. 2115 SOA nsa.perf1.fr. technical.nameshield.net. 2026022612 28800 7200 604800 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0