floating-self-ip-address-01.register.it has no MX records.
Question and response
Question
dig floating-self-ip-address-01.register.it. MX
Answer
The response has no answer records.
Authority
register.it. 7200 SOA ns1.register.it. hostmaster.register.it. 2026030402 10800 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0