internoit.nunsys.net has no MX records.
Question and response
Question
dig internoit.nunsys.net. MX
Answer
The response has no answer records.
Authority
nunsys.net. 86400 SOA ns1.nunsys.net. soporteweb.nunsys.com. 2026020900 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0