fdspfus2.freshemail.io has no NS records.
NS records for this zone are defined at freshemail.io.
NS records for this zone are defined at freshemail.io.
Question and response
Question
dig fdspfus2.freshemail.io. NS
Answer
The response has no answer records.
Authority
freshemail.io. 900 SOA ns-1213.awsdns-23.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0