669984.cloud4box.ru has no MX records.
Question and response
Question
dig 669984.cloud4box.ru. MX
Answer
The response has no answer records.
Authority
cloud4box.ru. 3600 SOA ns1.contell.ru. tech.contell.ru. 2021140734 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0