smtp.tiscali.it has no CNAME records.
Question and response
Question
dig smtp.tiscali.it. NS
Answer
The response has no answer records.
Authority
tiscali.it. 7496 SOA barakus.dns.tiscali.it. nsadmin.it.tiscali.com. 2026030500 86400 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0