ns3.telecentro.net.ar has no MX records.
Question and response
Question
dig ns3.telecentro.net.ar. MX
Answer
The response has no answer records.
Authority
telecentro.net.ar. 900 SOA ns1.telecentro.net.ar. webmaster.telecentro.com.ar. 2026022501 7200 3600 172800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0