_spf.enflow.email has no MX records.
Question and response
Question
dig _spf.enflow.email. MX
Answer
The response has no answer records.
Authority
enflow.email. 1800 SOA ns1.enflow.nl. hostmaster.enflow.nl. 1627552798 10800 3600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0