mail.roalter.it has no CNAME records.
Question and response
Question
dig mail.roalter.it. NS
Answer
The response has no answer records.
Authority
roalter.it. 6485 SOA ns1.roalter.it. hostmaster.roalter.it. 2025102193 1200 7200 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0