mx.dominioabsoluto.net has no MX records.
Question and response
Question
dig mx.dominioabsoluto.net. MX
Answer
The response has no answer records.
Authority
dominioabsoluto.net. 86400 SOA ns3.acens.net. hostmaster.ns3.acens.net. 1771888559 14400 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0