mx02.hornetsecurity.com has no TXT records.
Question and response
Question
dig mx02.hornetsecurity.com. TXT
Answer
The response has no answer records.
Authority
hornetsecurity.com. 1800 SOA hank.ns.cloudflare.com. dns.cloudflare.com. 2397418553 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0