u950281.wl032.sendgrid.net has no AAAA records.
Question and response
Question
dig u950281.wl032.sendgrid.net. AAAA
Answer
The response has no answer records.
Authority
wl032.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2398624569 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0