mail.NETORN.RU has no MX records.
Question and response
Question
dig mail.NETORN.RU. MX
Answer
The response has no answer records.
Authority
NETORN.RU. 600 SOA ns1.netorn.net. admin.NETORN.RU. 2025060217 600 900 1800 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0