_spf.goskope.com has no MX records.
Question and response
Question
dig _spf.goskope.com. MX
Answer
The response has no answer records.
Authority
goskope.com. 300 SOA ns1.goskope.opskope.com. hostmaster.nsone.net. 1771867794 3600 600 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0