spf.mailservice.snelstart.nl has no NS records.
NS records for this zone are defined at snelstart.nl.
NS records for this zone are defined at snelstart.nl.
Question and response
Question
dig u2206867.wl118.sendgrid.net. NS
Answer
The response has no answer records.
Authority
wl118.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2398594883 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0