smtp1.ipnext.it has no CNAME records.
Question and response
Question
dig smtp1.ipnext.it. NS
Answer
The response has no answer records.
Authority
ipnext.it. 1767 SOA icaro.ipnext.it. noc.ipnext.it. 2026020700 21600 3600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0