_spf.ozone.net has no MX records.
Question and response
Question
dig _spf.ozone.net. MX
Answer
The response has no answer records.
Authority
ozone.net. 3600 SOA ns.ozone.net. admin.ozone.net. 2025071501 7200 3600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0