mx.bigpond.com has no TXT records.
Question and response
Question
dig mx.bigpond.com. TXT
Answer
The response has no answer records.
Authority
mx.bigpond.com. 3600 SOA adns01.bigpond.com. hostmaster.bigpond.com. 2021030301 43200 3600 2419200 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0