smtp.netscalibur.it has no MX records.
Question and response
Question
dig smtp.netscalibur.it. MX
Answer
The response has no answer records.
Authority
netscalibur.it. 86400 SOA ns1mi.infracom.it. sistemi.infracom.it. 2022071401 7200 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0