ns2.byteopt.com has no MX records.
Question and response
Question
dig ns2.byteopt.com. MX
Answer
The response has no answer records.
Authority
byteopt.com. 300 SOA pns.speednet.bg. cpanel.speednet.bg. 2026020101 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0