mail.dmin.pro has no TXT records.
Question and response
Question
dig mail.dmin.pro. TXT
Answer
The response has no answer records.
Authority
dmin.pro. 3600 SOA ns1.reg.com. hostmaster.ns1.reg.com. 1766084730 14400 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0