mail.icspr.it has no CNAME records.
Question and response
Question
dig mail.icspr.it. NS
Answer
The response has no answer records.
Authority
icspr.it. 2487 SOA ns1.serverlet.com. info.serverlet.com. 2025022005 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0