edgmailer2-15s.broadridge.com has no CNAME records.
Question and response
Question
dig edgmailer2-15s.broadridge.com. NS
Answer
The response has no answer records.
Authority
broadridge.com. 586 SOA edns1.ultradns.com. enterprisedns.broadridge.com. 2026011214 600 3600 691200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0