mail.gotobg.net has no CNAME records.
Question and response
Question
dig mail.gotobg.net. NS
Answer
The response has no answer records.
Authority
gotobg.net. 9734 SOA ns1.gotobg.net. admin.goto.bg. 2025022001 28800 7200 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0