stmail.ro has no CNAME records.
Question and response
Question
dig stmail.ro. NS
Answer
The response has no answer records.
Authority
ro. 3451 SOA primary.rotld.ro. hostmaster.rotld.ro. 2018326020 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0