mx-p2.uol.com.br has no TXT records.
Question and response
Question
dig mx-p2.uol.com.br. TXT
Answer
The response has no answer records.
Authority
uol.com.br. 60 SOA a10-dns-uolcsfe1.host.intranet. root.uol.com.br. 2016057347 7200 3600 432000 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0