dns3.arubadns.net has no MX records.
Question and response
Question
dig dns3.arubadns.net. MX
Answer
The response has no answer records.
Authority
arubadns.net. 3600 SOA arudns1.aruba.it. hostmaster.arubadns.net. 2025010202 86400 7200 2592000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0