smtp.SNDSY.RU has no NS records.
NS records for this zone are defined at SNDSY.RU.
NS records for this zone are defined at SNDSY.RU.
Question and response
Question
dig smtp.SNDSY.RU. NS
Answer
The response has no answer records.
Authority
SNDSY.RU. 3600 SOA ns.iprojects.RU. noc.iprojects.RU. 2023051299 10800 1100 864000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0