mx.ipacct.bg has no CNAME records.
Question and response
Question
dig mx.ipacct.bg. NS
Answer
The response has no answer records.
Authority
ipacct.bg. 10800 SOA ns.ipacct.bg. noc.ipacct.com. 2025051601 10800 3600 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0