mail.sandranicolle.com has no CNAME records.
Question and response
Question
dig mail.sandranicolle.com. NS
Answer
The response has no answer records.
Authority
sandranicolle.com. 5352 SOA ns2.sandranicolle.com. root.ns3008652.ip-149-202-66.eu. 2026021207 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0