mail1.intred.it has no MX records.
Question and response
Question
dig mail1.intred.it. MX
Answer
The response has no answer records.
Authority
intred.it. 300 SOA dns1.intred.it. hostmaster.intred.it. 2026012602 3600 600 3600000 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0