ns143.neubox.net has no MX records.
Question and response
Question
dig ns143.neubox.net. MX
Answer
The response has no answer records.
Authority
neubox.net. 1800 SOA ada.ns.cloudflare.com. dns.cloudflare.com. 2398304272 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0