cp_spf.inasset.net has no MX records.
Question and response
Question
dig cp_spf.inasset.net. MX
Answer
The response has no answer records.
Authority
inasset.net. 3600 SOA ns1.inasset.net. support.inasset.net. 2025102401 43200 7200 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0