nameserver.cnr.it has no MX records.
Question and response
Question
dig nameserver.cnr.it. MX
Answer
The response has no answer records.
Authority
cnr.it. 3600 SOA dns.cnr.it. m\.astolfi.src.cnr.it. 2026021301 86400 3600 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0