mx10.it.com has no TXT records.
Question and response
Question
dig mx10.it.com. TXT
Answer
The response has no answer records.
Authority
it.com. 1800 SOA ns1.it.com. dns.cloudflare.com. 2398074527 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0