pmxhds01.cegedim.fr has no CNAME records.
Question and response
Question
dig pmxhds01.cegedim.fr. NS
Answer
The response has no answer records.
Authority
cegedim.fr. 3600 SOA ns1.cegedim.fr. hostmaster.cegedim.com. 65912 3600 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0