spfa.protection.outlook.com has no NS records.
NS records for this zone are defined at protection.outlook.com.
NS records for this zone are defined at protection.outlook.com.
Question and response
Question
dig spfa.protection.outlook.com. NS
Answer
The response has no answer records.
Authority
protection.outlook.com. 120 SOA ns1-35.azure-dns.com. hostmaster.o365filtering.com. 2024081305 10800 3600 604800 120
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0