mx.byet.net has no TXT records.
Question and response
Question
dig mx.byet.net. TXT
Answer
The response has no answer records.
Authority
byet.net. 1800 SOA johnathan.ns.cloudflare.com. dns.cloudflare.com. 2397355808 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0