dns3.mrse.com.ar has no MX records.
Question and response
Question
dig dns3.mrse.com.ar. MX
Answer
The response has no answer records.
Authority
mrse.com.ar. 86400 SOA dns1.mrse.com.ar. tasamail.telefonica.com.ar. 2025011012 10800 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0