ns3.panelbox.net has no MX records.
Question and response
Question
dig ns3.panelbox.net. MX
Answer
The response has no answer records.
Authority
panelbox.net. 300 SOA ns1.io-servers.com. admin.io-servers.com. 2025112103 86400 7200 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0