mail.hrs-it.com has no CNAME records.
Question and response
Question
dig mail.hrs-it.com. NS
Answer
The response has no answer records.
Authority
hrs-it.com. 900 SOA ns1s.itocservices.net. no-reply.conduent.com. 2022081765 10800 3600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0