ns2.dnsres.net has no MX records.
Question and response
Question
dig ns2.dnsres.net. MX
Answer
The response has no answer records.
Authority
dnsres.net. 180 SOA anycast1.dnsres.net. tech.key-systems.net. 2025065435 3600 600 604800 180
Additional
. 0 OPT ; payload 1400, xrcode 0, version 0, flags 0