ns3.minsal.cl has no MX records.
Question and response
Question
dig ns3.minsal.cl. MX
Answer
The response has no answer records.
Authority
minsal.cl. 900 SOA ns.minsal.cl. infraestructura.minsal.cl. 2015076093 600 600 86400 3600
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0