mail.nic.it has no CNAME records.
Question and response
Question
dig mail.nic.it. NS
Answer
The response has no answer records.
Authority
nic.it. 600 SOA dns.nic.it. hostmaster.nic.it. 2026030300 86400 1800 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0