scale-devserver.delong.com has no MX records.
Question and response
Question
dig scale-devserver.delong.com. MX
Answer
The response has no answer records.
Authority
delong.com. 60 SOA ns.delong.sj.ca.us. postmaster.delong.sj.ca.us. 2026011634 43200 300 604800 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0