ns.hostnexus.com has no MX records.
Question and response
Question
dig ns.hostnexus.com. MX
Answer
The response has no answer records.
Authority
hostnexus.com. 600 SOA ns2.hostnexus.com. bollox.jjj.com. 2024070301 10800 3600 604800 10800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0