gate136.mta1.STSENDER.RU has no CNAME records.
Question and response
Question
dig gate136.mta1.STSENDER.RU. NS
Answer
The response has no answer records.
Authority
STSENDER.RU. 2983 SOA ns1.nameself.com. support.regtime.net. 1753259044 300 300 604800 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0