_spfa.telekom.com has no NS records.
NS records for this zone are defined at telekom.com.
NS records for this zone are defined at telekom.com.
Question and response
Question
dig _spfa.telekom.com. NS
Answer
The response has no answer records.
Authority
telekom.com. 600 SOA dns1.telekom.de. dnsadmin.t-systems.com. 2019033521 10800 1800 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0