mx1.a1.net has no TXT records.
Question and response
Question
dig mx1.a1.net. TXT
Answer
The response has no answer records.
Authority
a1.net. 3600 SOA dns1.a1.net. domainadmin.a1.net. 2026022504 10800 3600 1814400 3600
Additional
. 0 OPT ; payload 1400, xrcode 0, version 0, flags 0