mail.thoughtindustries.com has no AAAA records.
Question and response
Question
dig u807214.wl215.sendgrid.net. AAAA
Answer
The response has no answer records.
Authority
wl215.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2398632403 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0