mail.mlrtk.com has no TXT records.
Question and response
Question
dig mail.mlrtk.com. TXT
Answer
The response has no answer records.
Authority
mlrtk.com. 3600 SOA pns31.cloudns.net. support.cloudns.net. 2025102601 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0