dns3.kinghost.com.br has no MX records.
Question and response
Question
dig dns3.kinghost.com.br. MX
Answer
The response has no answer records.
Authority
kinghost.com.br. 3600 SOA dns1.kinghost.com.br. abuse.kinghost.com.br. 2023111801 3600 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0