ns2.worldwidedns.net has no MX records.
Question and response
Question
dig ns2.worldwidedns.net. MX
Answer
The response has no answer records.
Authority
worldwidedns.net. 86400 SOA ns1.worldwidedns.net. hostmaster.worldwidedns.net. 2025020315 21600 10800 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0