spf.smtp-tsl-sp.kinghost.net has no MX records.
Question and response
Question
dig spf.smtp-tsl-sp.kinghost.net. MX
Answer
The response has no answer records.
Authority
smtp-tsl-sp.kinghost.net. 3600 SOA dns1.kinghost.com.br. abuse.kinghost.net. 2208120001 3600 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0