postal-smtp.soneribank.com has no CNAME records.
Question and response
Question
dig postal-smtp.soneribank.com. NS
Answer
The response has no answer records.
Authority
soneribank.com. 1800 SOA bradley.ns.cloudflare.com. dns.cloudflare.com. 2398535552 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0