fallbackdt.mx-relay.com has no TXT records.
Question and response
Question
dig fallbackdt.mx-relay.com. TXT
Answer
The response has no answer records.
Authority
mx-relay.com. 3600 SOA ns1.witxl.nl. hostmaster.mx-relay.com. 2025112101 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0