nameserver.ge.ieiit.cnr.it has no MX records.
Question and response
Question
dig nameserver.ge.ieiit.cnr.it. MX
Answer
The response has no answer records.
Authority
ge.ieiit.cnr.it. 86400 SOA nameserver.ge.ieiit.cnr.it. aiello.ieiit.cnr.it. 20121433 86400 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0