mail.blix.com has no TXT records.
Question and response
Question
dig mail.blix.com. TXT
Answer
The response has no answer records.
Authority
blix.com. 60 SOA ns1.blix.com. blix.com. 2026030202 28800 7200 604800 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0