ns1.ucnlabext.com has no MX records.
Question and response
Question
dig ns1.ucnlabext.com. MX
Answer
The response has no answer records.
Authority
ucnlabext.com. 3600 SOA ena-innse01.dradev.lab. syseng.incontact.com. 1454 900 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0