mail.derecho.uncu.edu.ar has no MX records.
Question and response
Question
dig mail.derecho.uncu.edu.ar. MX
Answer
The response has no answer records.
Authority
derecho.uncu.edu.ar. 60 SOA ns1.derecho.uncu.edu.ar. hostmaster.derecho.uncu.edu.ar. 2025072800 604800 86400 2419200 604800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0