s1asubv7hiejb21v0geuqvoj4fkjg1q3.spamfilter.io AXFR zone transfer

Not an apex domain The domain s1asubv7hiejb21v0geuqvoj4fkjg1q3.spamfilter.io is not the root of its zone.
Instead, try zone transfer on spamfilter.io .