it4smtp01.vhosting.it has no CNAME records.
Question and response
Question
dig it4smtp01.vhosting.it. NS
Answer
The response has no answer records.
Authority
vhosting.it. 428 SOA daisy.ns.cloudflare.com. dns.cloudflare.com. 2394051392 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0