dns4.infoave.net has no MX records.
Question and response
Question
dig dns4.infoave.net. MX
Answer
The response has no answer records.
Authority
infoave.net. 300 SOA ns1.neonova.net. hostmaster.neonova.net. 2016122200 300 1800 1209600 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0