mainns.net has no TXT records.
Question and response
Question
dig mainns.net. TXT
Answer
The response has no answer records.
Authority
mainns.net. 86400 SOA ns1.mainns.de. info.domains.resellerinterface.de. 1769416729 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0