_spf.aspmail.info has no CNAME records.
Question and response
Question
dig _spf.aspmail.info. NS
Answer
The response has no answer records.
Authority
aspmail.info. 10800 SOA ns0.eolas.fr. postmaster.eolas.fr. 2024090205 86400 7200 1209600 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0