edu.ar has no MX records.
Question and response
Question
dig edu.ar. MX
Answer
The response has no answer records.
Authority
edu.ar. 3600 SOA a.riu.edu.ar. hostmaster.riu.edu.ar. 2026021906 7200 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0