mta.us.confirmit.com has no TXT records.
Question and response
Question
dig mta.us.confirmit.com. TXT
Answer
The response has no answer records.
Authority
confirmit.com. 86400 SOA udns1.cscdns.net. hostmaster.cscdns.net. 2018082972 10800 1800 1814400 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0