mail.accountsupport.com has no TXT records.
Question and response
Question
dig mail.accountsupport.com. TXT
Answer
The response has no answer records.
Authority
accountsupport.com. 3600 SOA ns1.yourhostingaccount.com. admin.yourhostingaccount.com. 2004012601 10800 3600 700000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0