mx.jk.locaweb.com.br has no TXT records.
Question and response
Question
dig mx.jk.locaweb.com.br. TXT
Answer
The response has no answer records.
Authority
jk.locaweb.com.br. 3600 SOA ns1.locaweb.com.br. hostmaster.locaweb.com.br. 2022260901 3600 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0