ns2.fad.uncuyo.edu.ar has no MX records.
Question and response
Question
dig ns2.fad.uncuyo.edu.ar. MX
Answer
The response has no answer records.
Authority
fad.uncuyo.edu.ar. 604800 SOA ns1.fad.uncuyo.edu.ar. root.fad.uncuyo.edu.ar. 202312197 300 86400 2419200 604800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0