spf.eu.signature365.net has no NS records.
NS records for this zone are defined at signature365.net.
NS records for this zone are defined at signature365.net.
Question and response
Question
dig spf.eu.signature365.net. NS
Answer
The response has no answer records.
Authority
signature365.net. 1800 SOA art.ns.cloudflare.com. dns.cloudflare.com. 2400238402 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0