cetus.ocs.RU has no MX records.
Question and response
Question
dig cetus.ocs.RU. MX
Answer
The response has no answer records.
Authority
ocs.RU. 3600 SOA ns.ocs.RU. admin.ocs.RU. 2026030501 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0