mx.dns-servicio.com has no MX records.
Question and response
Question
dig mx.dns-servicio.com. MX
Answer
The response has no answer records.
Authority
dns-servicio.com. 283 SOA ns3.acens.net. hostmaster.ns3.acens.net. 1771932241 14400 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0