_spf.fastmail.gr has no NS records.
NS records for this zone are defined at fastmail.gr.
NS records for this zone are defined at fastmail.gr.
Question and response
Question
dig _spf.fastmail.gr. NS
Answer
The response has no answer records.
Authority
fastmail.gr. 1800 SOA alec.ns.cloudflare.com. dns.cloudflare.com. 2397395738 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0