smtp.sbarailconnect.com has no CNAME records.
Question and response
Question
dig smtp.sbarailconnect.com. NS
Answer
The response has no answer records.
Authority
sbarailconnect.com. 1235 SOA danica.ns.cloudflare.com. dns.cloudflare.com. 2394613011 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0