spf.jetsmtp.net has no NS records.
NS records for this zone are defined at jetsmtp.net.
NS records for this zone are defined at jetsmtp.net.
Question and response
Question
dig spf.jetsmtp.net. NS
Answer
The response has no answer records.
Authority
jetsmtp.net. 1800 SOA melina.ns.cloudflare.com. dns.cloudflare.com. 2396931151 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0