smtp2.lerelaisinternet.com has no CNAME records.
Question and response
Question
dig smtp2.lerelaisinternet.com. NS
Answer
The response has no answer records.
Authority
lerelaisinternet.com. 1704 SOA name.nordnet.fr. root.nordnet.fr. 2026030201 10800 3600 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0