ns1.fad.uncu.edu.ar has no MX records.
Question and response
Question
dig ns1.fad.uncu.edu.ar. MX
Answer
The response has no answer records.
Authority
fad.uncu.edu.ar. 300 SOA ns1.fad.uncu.edu.ar. root.fad.uncu.edu.ar. 202312199 300 86400 2419200 604800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0