dc1.ad.aruba.it has no MX records.
Question and response
Question
dig dc1.ad.aruba.it. MX
Answer
The response has no answer records.
Authority
ad.aruba.it. 3600 SOA dc2.ad.aruba.it. hostmaster. 5158500 900 600 86400 3600
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0