firewallrbx.cyber.it has no MX records.
Question and response
Question
dig firewallrbx.cyber.it. MX
Answer
The response has no answer records.
Authority
cyber.it. 900 SOA ns1.register.it. hostmaster.register.it. 2025120502 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0