mx1.MIRAN.RU has no TXT records.
Question and response
Question
dig mx1.MIRAN.RU. TXT
Answer
The response has no answer records.
Authority
MIRAN.RU. 3600 SOA ns.MIRAN.RU. noc.MIRAN.RU. 2019055376 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0