_spf.kinghost.net has no MX records.
Question and response
Question
dig _spf.kinghost.net. MX
Answer
The response has no answer records.
Authority
kinghost.net. 28800 SOA dns1.kinghost.com.br. abuse.kinghost.com.br. 2307120001 3600 600 86400 28800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0