smtp.appazur.com has no TXT records.
Question and response
Question
dig smtp.appazur.com. TXT
Answer
The response has no answer records.
Authority
appazur.com. 1800 SOA andy.ns.cloudflare.com. dns.cloudflare.com. 2398172099 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0