mx.fastcon.it has no MX records.
Question and response
Question
dig mx.fastcon.it. MX
Answer
The response has no answer records.
Authority
fastcon.it. 3600 SOA dns.technorail.com. hostmaster.fastcon.it. 2025120801 86400 7200 2592000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0