mx.NCNET.RU has no TXT records.
Question and response
Question
dig mx.NCNET.RU. TXT
Answer
The response has no answer records.
Authority
ncnet.ru. 3600 SOA nsmt.rt.ru. hostmasternsmt.rt.ru. 2020122400 86400 7200 604800 3600
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0