ip.fdtnet.net has no MX records.
Question and response
Question
dig ip.fdtnet.net. MX
Answer
The response has no answer records.
Authority
ip.fdtnet.net. 3600 SOA ns1.firstdigital.com. technicalservice.firstdigital.com. 2025022006 900 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0