mail.api.oxxa.com has no TXT records.
Question and response
Question
dig mail.api.oxxa.com. TXT
Answer
The response has no answer records.
Authority
api.oxxa.com. 3600 SOA ns1.satserver.nl. hostmaster.satserver.nl. 2026022301 28800 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0