spf.mail.namecheap.tech has no NS records.
NS records for this zone are defined at namecheap.tech.
NS records for this zone are defined at namecheap.tech.
Question and response
Question
dig spf.mail.namecheap.tech. NS
Answer
The response has no answer records.
Authority
namecheap.tech. 1800 SOA edns.registrar-servers.com. support.namecheap.com. 1771928976 28800 7200 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0