ns3.domains.neustar has no MX records.
Question and response
Question
dig ns3.domains.neustar. MX
Answer
The response has no answer records.
Authority
domains.neustar. 3600 SOA ns1.usatfus.about.us. enrique\.somoza.team.neustar. 2018012994 10800 3600 700000 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0