spfus.doxim.com has no NS records.
NS records for this zone are defined at doxim.com.
NS records for this zone are defined at doxim.com.
Question and response
Question
dig spfus.doxim.com. NS
Answer
The response has no answer records.
Authority
doxim.com. 1800 SOA ivan.ns.cloudflare.com. dns.cloudflare.com. 2398202014 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0