mta1.pointermail.com.br has no TXT records.
Question and response
Question
dig mta1.pointermail.com.br. TXT
Answer
The response has no answer records.
Authority
pointermail.com.br. 900 SOA ns-502.awsdns-62.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0