3366455.spf10.hubspotemail.net has no NS records.
NS records for this zone are defined at spf10.hubspotemail.net.
NS records for this zone are defined at spf10.hubspotemail.net.
Question and response
Question
dig 3366455.spf10.hubspotemail.net. NS
Answer
The response has no answer records.
Authority
spf10.hubspotemail.net. 180 SOA ns10.digicertdns.com. dns.digicertdns.com. 2009010105 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0