ns3.unitedlayer.com has no MX records.
Question and response
Question
dig ns3.unitedlayer.com. MX
Answer
The response has no answer records.
Authority
unitedlayer.com. 3600 SOA ns1.unitedlayer.com. root.unitedlayer.com. 2026022701 3600 900 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0