neustar has no MX records.
Question and response
Question
dig neustar. MX
Answer
The response has no answer records.
Authority
neustar. 900 SOA ns1.dns.nic.neustar. admin.tldns.godaddy. 1772390554 1800 300 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0