mail.ysbstech.com has no CNAME records.
Question and response
Question
dig mail.ysbstech.com. NS
Answer
The response has no answer records.
Authority
ysbstech.com. 2676 SOA ns1.ysbstech.com. hussain.fr-system.com. 2025092302 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0