ns3.top-consulting.net has no MX records.
Question and response
Question
dig ns3.top-consulting.net. MX
Answer
The response has no answer records.
Authority
top-consulting.net. 36000 SOA ns3.top-consulting.net. sheken.top-consulting.net. 2019030200 3600 1700 9999999 36000
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0