nsc2.a2u2.com has no MX records.
Question and response
Question
dig nsc2.a2u2.com. MX
Answer
The response has no answer records.
Authority
a2u2.com. 3600 SOA odin.a2u2.com. dnsadmin.cyberlynk.net. 2026012100 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0