mail.thezone.bg has no MX records.
Question and response
Question
dig mail.thezone.bg. MX
Answer
The response has no answer records.
Authority
thezone.bg. 600 SOA ns.thezone.bg. support.thezone.bg. 2025122203 10800 1200 1209600 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0