smtp.anniksystems.com has no CNAME records.
Question and response
Question
dig smtp.anniksystems.com. NS
Answer
The response has no answer records.
Authority
anniksystems.com. 1409 SOA jacob.ns.cloudflare.com. dns.cloudflare.com. 2397184971 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0