ns3.cronosinternet.net has no MX records.
Question and response
Question
dig ns3.cronosinternet.net. MX
Answer
The response has no answer records.
Authority
cronosinternet.net. 300 SOA ns1.cronosinternet.net. support.cronosinternet.net. 2024121201 3600 300 2419200 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0