ns3.btlatam.com.br has no MX records.
Question and response
Question
dig ns3.btlatam.com.br. MX
Answer
The response has no answer records.
Authority
btlatam.com.br. 3600 SOA ns1.sencinet.com.br. root.ns1.sencinet.com.br. 2023110901 10800 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0