_spf.registrarhub.net has no MX records.
Question and response
Question
dig _spf.registrarhub.net. MX
Answer
The response has no answer records.
Authority
registrarhub.net. 7200 SOA ns1.mijndnsserver.nl. hostmaster.registrarhub.net. 2026022801 28800 7200 2419200 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0