s1.domainkey.u14174057.wl058.sendgrid.net has no NS records.
NS records for this zone are defined at wl058.sendgrid.net.
NS records for this zone are defined at wl058.sendgrid.net.
Question and response
Question
dig s1.domainkey.u14174057.wl058.sendgrid.net. NS
Answer
The response has no answer records.
Authority
wl058.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2400198565 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0