ns.fing.uncu.edu.ar has no MX records.
Question and response
Question
dig ns.fing.uncu.edu.ar. MX
Answer
The response has no answer records.
Authority
fing.uncu.edu.ar. 300 SOA ns1.fing.uncu.edu.ar. hostmaster.fing.uncu.edu.ar. 5029 300 300 300 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0