admin.halcyon.com has no MX records.
Question and response
Question
dig admin.nwnexus.com. MX
Answer
The response has no answer records.
Authority
nwnexus.com. 86400 SOA ns-1.nuoz.net. postmaster.nwnexus.com. 2026022000 7200 3600 864000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0