u950281.wl032.sendgrid.net has no CNAME records.
Question and response
Question
dig u950281.wl032.sendgrid.net. NS
Answer
The response has no answer records.
Authority
wl032.sendgrid.net. 1605 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2398628550 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0