relayserver.mailtempresas.com.ar has no MX records.
Question and response
Question
dig relayserver.mailtempresas.com.ar. MX
Answer
The response has no answer records.
Authority
mailtempresas.com.ar. 600 SOA dns1.advance.com.ar. dominios.advance.com.ar. 2025081401 1080 3600 3600 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0