sg12.domainkey.u33381347.wl098.sendgrid.net has no NS records.
NS records for this zone are defined at wl098.sendgrid.net.
NS records for this zone are defined at wl098.sendgrid.net.
Question and response
Question
dig sg12.domainkey.u33381347.wl098.sendgrid.net. NS
Answer
The response has no answer records.
Authority
wl098.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2400219329 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0