n2nmail.affingroup.com has no CNAME records.
Question and response
Question
dig n2nmail.affingroup.com. NS
Answer
The response has no answer records.
Authority
affingroup.com. 238 SOA bonnie.ns.cloudflare.com. dns.cloudflare.com. 2398127961 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0