mx1.useast.radiusbycampusmgmt.com has no CNAME records.
Question and response
Question
dig mx1.useast.radiusbycampusmgmt.com. NS
Answer
The response has no answer records.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0