rsndr.ru has no MX records.
Question and response
Question
dig rsndr.ru. MX
Answer
The response has no answer records.
Authority
rsndr.ru. 1800 SOA ns1.domenus.ru. support.domenus.ru. 2024072974 3600 300 1209600 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0