ns3.twdcns.info has no MX records.
Question and response
Question
dig ns3.twdcns.info. MX
Answer
The response has no answer records.
Authority
twdcns.info. 1800 SOA aa-eorcrp-dscsgm4-ns.disney.com. corp\.dns\.domains.disney.com. 24 10800 3600 2419200 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0