_spf.go.net-results.com has no MX records.
Question and response
Question
dig _spf.go.net-results.com. MX
Answer
The response has no answer records.
Authority
net-results.com. 3600 SOA ns43.domaincontrol.com. dns.jomax.net. 2026012301 28800 7200 604800 3600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0