mail.ocswork.ru has no MX records.
Question and response
Question
dig mail.ocswork.ru. MX
Answer
The response has no answer records.
Authority
ocswork.ru. 1200 SOA ns01.1cloud.ru. support.1cloud.ru. 2026030501 1800 900 604800 1200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0