mx2.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 mx2.fastmail.gr. NS
Answer
The response has no answer records.
Authority
fastmail.gr. 1800 SOA alec.ns.cloudflare.com. dns.cloudflare.com. 2394115862 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0