_spf.seppmail.dev has no CNAME records.
Question and response
Question
dig _spf.seppmail.dev. NS
Answer
The response has no answer records.
Authority
seppmail.dev. 39 SOA ns1.itmnetx.com. do-not-reply.seppmail.dev. 2026030400 43200 7200 1209600 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0