sapsmtp.cyber.net.pk has no CNAME records.
Question and response
Question
dig sapsmtp.cyber.net.pk. NS
Answer
The response has no answer records.
Authority
cyber.net.pk. 1800 SOA kianchau.ns.cloudflare.com. dns.cloudflare.com. 2398035298 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0