ns3.fidnet.com has no MX records.
Question and response
Question
dig ns3.fidnet.com. MX
Answer
The response has no answer records.
Authority
fidnet.com. 3600 SOA ns1.fidnet.com. root.fidnet.com. 2025101505 3600 900 604800 10800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0