sp5-1.sci-nnov.ru has no MX records.
Question and response
Question
dig sp5-1.sci-nnov.ru. MX
Answer
The response has no answer records.
Authority
sci-nnov.ru. 3600 SOA dns0.mts.ru. dns.mts.ru. 2025031803 3600 900 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0