mail.hypermail.bg has no CNAME records.
Question and response
Question
dig mail.hypermail.bg. NS
Answer
The response has no answer records.
Authority
hypermail.bg. 171 SOA ns1.byteopt.com. cpanel.speednet.bg. 2026021303 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0