mhost-micso.micso.it has no MX records.
Question and response
Question
dig mhost-micso.micso.it. MX
Answer
The response has no answer records.
Authority
micso.it. 300 SOA ns1.micso.it. hostmaster.micso.it. 2026022001 600 300 2592000 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0