wl220.sendgrid.net has no TXT records.
Question and response
Question
dig wl220.sendgrid.net. TXT
Answer
The response has no answer records.
Authority
wl220.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2398185701 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0